Here is the full list of all 13 Apple Slash achievements.
Beat the game without taking damage.
Kill the Blob Mother 3 times.
Find the secret concert.
Departure in under 15 minutes.
No damage during the Blob Mother's fight.
Kill 1000 blobs.
Avoid Gumm's trap.
You beat the game!
Defeat the Blob Mother.
Kill the Blob Mother once.
Kill 500 blobs.
Acquire the special skills.
Kill 250 blobs.