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