Here is the full list of all 17 Noclipped achievements.
Kill 100 entities
Get killed by the rare OwO smiler
Play Sandbox more at least once
Kill 50 entities
Die for the first time
Pick up firesalt
Stare at the floor for 20 minutes
Reach 0 sanity
Kill 25 entities
Kill 10 entities
Find a computer and click on the keyboard 50 times or more
Parry an entity attack for the first time
Kill 1 entity
Craft your first weapon
Pick up carpet mushrooms
No-clip out of reality and enter level 0
Explore all of the levels available in chapter 1