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