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