Tyria is a Reyvateil who joins in Phase 4. To get her normal ending, you cannot give all three hearts to the same Reyvateil. You must complete level 3 of her Cosmosphere BEFORE you synthesize the Glasteria Plate. After you complete level 3, rest at an inn or save point. There will be an event, and you must accept her. After you synthesize the Glasteria Plate, you will be given a choice. Choose "I want to save Tyria" and the game will immediately end. After the credits and the following event, you unlock this trophy.

To earn Tyria's ending, you must reach Phase 4, and cannot have any Reyvateils with three hearts and you cannot accept any of the Reyvateils in their level 8 Cosmosphere. You must complete level 3 of her Cosmosphere, BEFORE you make the Glasteria Plate, and rest. Accept Tyria in this event (this unlocks the Lovey Dovey with Tyria trophy), and synthesize the Glasteria Plate. Afterwards, you will have a decision. Choose "I'll actually save the world!", and continue to finish Phase 4 normally. Defeat the final boss and watch the ending, credits, and the events. This should pop up.

To earn Cocona's ending, you cannot give any of the Reyvateils all three hearts, and you cannot accept them in their level 8 Cosmosphere. Do not accept Tyria if you complete her level 3 Cosmosphere (ideally, do not touch her level 3 Cosmosphere at all). Complete Phase 4 and defeat the final boss, and you will earn this ending. After the events after the credits, this should unlock.

To get the bad ending, you have to fail to defeat the MYU within the time limit and in Mooncheriel, you must choose to stop Saki's singing. After you stop her singing, you will fight a boss. After you win, you will get this ending.

See Tyria's Darling.

See Tyria's Darling.

You must first reach Phase 4, since Tyria joins this late in the game. To earn this trophy, you must complete all three levels of her Cosmosphere. You must earn all three endings (Bad, Normal, and Happy) in her level 3 Cosmosphere. I recommend completing her Cosmosphere while aiming for her endings, although it can be completed on Saki's or Finnel's true paths.

If you need help in completing Tyria's Cosmosphere, you can look at this walkthrough. Credit given to drachemeister: http://www.gamefaqs.com/ps3/976762-ar-tonelico-qoga-knell-of-ar-ciel/faqs/62080

You must run from battle 100 times, in the same playthrough. To run, when you enter battle, press to bring up the Battle Menu. Choose "Escape". It works 100% of the time (you cannot escape from boss battles, however). I got this while looking for all the treasure chests. Fleeing does not empty the Encounter Bar.

You will likely get this trophy while aiming for The Fighting Machine. You have to deplete the Encounter Bar which is located on the bottom right part of the screen. As you walk around, this bar turns from blue to red, and the closer to red it gets, the more likely you will enter a battle. When you win a battle, the Encounter Bar depletes a little bit, and once it completely depletes, you will no longer have any random encounters as long as you stay in the dungeon. Do this 25 times to earn this trophy. If you want to replete the bar, just leave the area and come back. It will fully replete. Saving and loading does NOT replete the bar.

To earn this trophy, you must press during Cosmosphere events. This brings up a random mudane picture that covers the screen. Do this 100 times (around 200 button presses) and this trophy should unlock. It can be done is Cosmosphere Replay from the Extras menu.

You should get this as you progress during the game. If not, you can continuously save at the same save point. After 100 saves, this trophy unlocks.

All six characters must reach level 99, the maximum level. Levels do carry over with New Game+. The best place to grind for EXP is in XP Shell.

Before you attempt this trophy, you must have completed level 6 with the Reyvateil you attempt to do this with. You must have purge animation set to ON. In battle, keep getting hits on enemies while a red beat (check the Harmograph on the bottom of the screen) to get Beat Ups. Even when the words "Purge Ready", you must continue to get Beat Ups (around 25). You must hold down any three shoulder buttons (, , , ), and while the Harmograph's bar is on a RED beat, shake your controller. If done correctly, you will see the Reyvateil purge three times at once with complete animation and this trophy should pop.

Here is a video on how it looks like. Credit is given to SplitPlaythru. Caution, this video may be NSFW.

This can be done at the same time as Return to Innocence, although it is not a prerequisite. Before you attempt this, you must have synthesize the ultimate moves for each Vanguard. The Supermoves needed are: ?Engineer EX? for Aota, ?V Board Trick SP? for Cocona, and ?Ultimate Med Tech? for Hikari Gojo. In battle, you must have a Reyvateil purged three levels. It does not have to be done all at once nor it has to be done on a red beat. After the Reyvateil has been purged three time, wait until the Burst guage reaches at least 30,000%. Go to the Battle Menu (press ) and choose "Supermove Execution". There will be an animation with the Vanguard's attack (and loses some clothes in the process). Wait until the Burst guage reaches 30,000% again, and go back to the Battle Menu. Choose a different Vanguard and choose "Supermove Execution" again. Wait for the Burst guage to reach 30,000% again and repeat the process for the third vanguard. This trophy should unlock during the animation. The MYU battle is a great place to attempt this, although Phase 4 has plenty of opportunities.

Here is a video on how it is done. Credit is given to SplitPlaythru. Caution, this video may be NSFW.
 
Note: While this player purged three levels at once, it is not necessary. You can purge one level at a time, but be sure to purge three levels.
 

To unlock this event, you must have picked Saki at the Garvelt Bridge in Phase 2. After the events at Lymph Vessel, rest at an inn (needed to continue the story), and this event unlocks.

To unlock this event, you must have picked Finnel at the Garvelt Bridge in Phase 2. Continue the story and you will unlock this event.

To unlock this event, you must have three hearts with Saki. This event unlocks before Moocheriel in Phase 3.

To unlock this event, you must have three hearts with Finnel. Continue the story and this event will unlock in late Phase 3.

This is story based and cannot be missed. This is a Phase 2 event.

To unlock this event, you must reach Phase 4 with none of the Reyvateils having three hearts. You cannot accept Saki nor Finnel in their level 8 Cosmosphere. Complete Tyria's level 3 Cosmosphere before you make the Glasteria Plate, and rest. Accept her, and you unlock this trophy. This is a prerequisite for Tyria Normal Ending and Tyria True Ending.

This is story based and cannot be missed. This is a Phase 1 event.

This is story based and cannot be missed. This is a Phase 2 event.

Aota takes a bath and finds a girl at the hot springs.

This is story based and cannot be missed. This is a Phase 2 event.

After you find Saki in the slave district, there will be an event with Saki and children.

This is an event in Saki's Cosmosphere, level 4. The second time you go to Love Nest, when you are given a choice, choose Saki (what you chose the first time does not matter). It will cost you 8000 DP, but you will see this artwork and the trophy. This event can be missed, but it does not affect Cosmosphere completion, and it can be gotten from "Cosmosphere Replay" in the Extras menu from the title screen.

Saki starts to disrobe, but then she decides to take a bath instead.

This is an event in Saki's Cosmosphere, level 4.

Saki and Sarapatra sing onstage.

This is an event in Saki's Cosmosphere, level 6.

This is an event where Filaments says she lost her heart due to humans.

This is an event in Saki's Cosmosphere, level 8. You must accept Saki before this event unlocks.

Saki has a baby daughter.

This is an event in Saki's Cosmosphere, level 9.

Sakia and Saki have gone shopping and Sakia is wearing a new dress.

This is an event in Finnel's Cosmosphere, the *real* level 3. This is located at the Happening Square after the event at Decisive Point. It must be done before you do the event at Matrimony Square. Although it can be gotten through Cosmosphere Replay from the Extras menu, I recommend you do not miss this event, as it is likely needed to complete Finnel's Cosmosphere.

Yurisica performs surgery on Aota.

This is an event in Finnel's Cosmosphere, the *real* level 5.

Finnel is seen on a chained leash.

This is an event in Finnel's Cosmosphere, level 7.

This event features a real Soma fighting a fake Soma.

This is an event in Finnel's Cosmosphere, level 8. You must accept Finnel before this event unlocks.

Finnel cries in Aota's arms.

This is an event in Finnel's Cosmosphere, level 9.

This is an event featuring Finnel and Suzunomia.

This is an event in Tyria's Cosmosphere, level 3. It appears during the Normal and Happy Endings.

Tyria is saving Aota and Kurogane who are falling off a ledge.

This is an event in Tyria's Cosmosphere, level 2 & level 3.

Aota has a muscle cramp while swimming and Tyria saves him.

This is an event in Tyria's Cosmosphere, level 3. It appears on the Normal and Happy Endings.

Artwork of Tyria and Aota in bed. Aota wears an Atelier Rorona shirt.