Here is the full list of all 37 Sakura Dungeon achievements.
Find all of the swimming wear outfits.
Use Yomi in your party.
Drive away the warrior from the shop.
Recruit Sylvi into your party.
Defeat the first floor guardian.
Clear the first floor of the dungeon.
Collect 10 outfits for your wardrobe.
Make the observatory operational again.
Acquire the Dual-Soul ability for Yomi.
Acquire the Astral Blade skill for Ceri.
Avoid an assassination attempt.
Step into the Abyss.
Acquire the warp gem.
Win your second battle against the succubus.
Give Anubis an offering of milk.
Recruit Captain Bonny into your party.
Recruit the Queen Bee into your party.
Recruit the Ryuuou into your party.
Defeat the reaper twins.
Recruit the Sand Sentinel into your party.
Recruit the Reaper Twins into your party.
Find every outfit in the game.
Reassemble the state of Fortuna.
Recruit Anubis into your party.
Recruit the Spirit Guardian into your party.
Recruit Maeve into your party.
Defeat 1,000 enemies.
Defeat 2,500 enemies.
Defeat 5,000 enemies.
Defeat the dungeon lord.
Win the game on hard mode.
Win the game on abyssal mode.
Recruit the chocolate mimic into your party.
Defeat Yomi.
Discover the fox girl's ship.
Defeat Hiriko.
Defeat Izanami.