Here is the full list of all 35 Trinity Trigger achievements.
Found 1 nice souvenir for Firn.
Recruited Zantis, a War Oracle of the Sun God.
Reached level 20 with one party member.
Discovered 5 different Manatite effects.
Embarked on a journey with Elise to prevent the God Warriors' duel.
Partnered up with Flamme.
Opened 10 treasure chests (excluding certain special chests).
Traveled through the Waterways to avoid the sandstorm and met the Diamond Wings.
Bid farewell to the Diamond Wings and headed toward Stahl.
Lost decisively in a mock duel against Violet.
Awakened new Trigger powers.
Pursued Ahter after he abducted Violet.
Began a new journey as a demigod.
Foiled the plans of Igment, God of Deceit.
Triumphed over Fasti the Chronicler in battle.
Proved your strength to Libras, God of Harmony.
Found 5 nice souvenirs for Firn.
Fulfilled all requests.
Crafted 10 times at a shop.
Crafted 100 times at a shop.
Discovered 20 different Manatite effects.
Opened 100 treasure chests (excluding certain special chests).
Opened 300 treasure chests (excluding certain special chests).
Reached level 45 with one party member.
Upgraded any weapon to its final form.
Defeated the First Memory.
Defeated the Second Memory.
Defeated the Third Memory.
Defeated the Fourth Memory.
Defeated the Fifth Memory.
Deciphered every obelisk inscription.
Held over 100,000 Liba at once.
Held over 500,000 Liba at once.
Defeated 1,000 enemies.
Defeated 5,000 enemies.