Here is the full list of all 51 Crystal Project achievements.
Beat the game's secret last boss.
Learn every Monster Magic spell.
Master the Scholar class.
Defeat 25 boss flames.
Open 500 treasure chests.
Beat the game.
Teleport to an unknown world.
Master the Summoner class.
Acquire every Summon.
Acquire a Summon.
Master the Beastmaster class.
Discover every Crystal.
Change a party member's name.
Breed a Golden Quintar.
Change a party member's gender.
Master the Valkyrie class.
Master the Assassin class.
Master the Samurai class.
Master the Dervish class.
Master the Nomad class.
Master the Beatsmith class.
Master the Ninja class.
Master the Hunter class.
Master the Mimic class.
Master the Reaper class.
Master the Aegis class.
Master the Shaman class.
Master the Fencer class.
Master the Warlock class.
Master the Chemist class.
Master the Monk class.
Learn a Monster Magic spell.
Have a party member reach max level.
Master the Weaver class.
Obtain an Owl companion.
Discover 12 Crystals.
Obtain an Ibek companion.
Obtain a Salmon companion.
Teleport to a far away land.
Discover 7 Crystals.
Obtain a Quintar companion.
Open 100 treasure chests.
Conquer the trials.
Defeat 5 boss flames.
Master the Wizard class.
Master the Cleric class.
Master the Warrior class.
Discover 3 Crystals.
Master the Rogue class.
Open 50 treasure chests.
Defeat a boss flame.