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