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