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