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