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