Here is the full list of all 7 Anime Girls: Sun of a Beach achievements.
Defeat 100 crab-like monsters.
Defeat over 1,000 crab-like monsters across all playthroughs.
Unlock all 6 girl characters.
Complete a level without any character taking damage.
Unlock all weapons in the game.
Clear every level on the beach.
Defeat your first crab-like monster.