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