Here is the full list of all 38 Pier Solar and the Great Architects achievements.
Received all trophies.
Did not give up on hope and fought for a better future.
Mastered the slippery game.
Became a slippery game god.
Completed the game fighting only the mandatory battles.
Found all spells that can be learned.
Found all master keys.
Collected all the treasures from all chests.
Gave up on hope and sacrificed yourself for a better future for your friends.
Defeated Bethina.
Defeated Kleoneo.
Bought all items available in the shops.
Found all Sega Genesis cartridges.
Defeated Cliboe.
Defeated Sasheer.
Equipped the best possible items on your characters.
Completed Arburus side-quest.
Discovered a fragment of another world in yours.
Defeated Ironhart.
Defeated the giant spider.
Finished professor Meyer's trials.
Defeated the bakery chef.
Defeated the Metal Robot at Timpo factory.
Used an ability that requires level 5 gather.
Defeated the Ludon excavation guardian.
Won 600 battles.
Defeated Ryan the lion.
Won 300 battles.
Solve the puzzle in Alina's dream on your first attempt.
Defeated the monster living in Teusa.
Won 100 battles.
Unlocked the sound test.
Defeated the Crab at the sanctuary.
Defeated the cave guardian.
Helped a hunter in his rabbit hunt.
Helped the bounty hunter to retrieve his treasure.
Won your first battle.
Enriched your knowledge by doing tutorials.