Here is the full list of all 53 Beautiful Mystic Survivors achievements.
Defeat level 2 final boss 3 times
Defeat a final boss with Isaya
Survive 16 minutes with Isaya
Defeat 200,000 enemies
Win 5 times
Defeat level 2 final boss 2 times
Defeat a final boss with Cassandra
Win the first level with 3 different characters
Evolve Shield 3 times
Walk 10,000 meters with the Fire Boots
Level up the Holy Pedant to level 4
Complete 6 secret shrine or cursed shrine challenges
Survive 16 minutes with Cassandra
Defeat level 2 final boss
Defeat a final boss with Rosaline
Survive 16 minutes with Rosaline
Defeat the first boss of level 2
Survive 16 minutes with Ciara
Defeat 100,000 enemies
Rescue Ciara
Complete 3 secret shrine or cursed shrine challenges
Defeat 20 elite enemies with the Scythe
Defeat the first boss of level 1 3 times
Use special abilities 250 times
Defeat level 1 final boss
Reach level 60
Rescue Melisandre
Complete secret shrine or cursed shrine challenge
Collect 4,000 gold during a single run
Obtain 3 legendary weapons
Defeat the first boss of level 1
Evolve the Sword
Collect 2,000 gold during a single run
Evolve the Bow
Collect 5,000 gold in total
Use special abilities 100 times
Collect 1,000 gold during a single run
Pickup 100 items from the ground
Pickup 30 healing potions
Use special abilities 50 times
Pickup 50 items from the ground
Pickup 10 items from the ground
Pickup 10 healing potions
Equip 6 passive items in a single run
Obtain a legendary weapon
Equip 6 weapons in a single run
Survive 5 minutes with any character
Defeat 400,000 enemies
Defeat a final boss with Ciara
Craft 200 potions with Sophia
Rescue Minos
Beat level 3 with Minos
Kill 5000 enemies with Minos' active ability