Full list of all 28 Definitely Sneaky But Not Sneaky achievements.
The base game contains 13 achievements, and there are 2 DLC packs containing 15 achievements.
Kill an enemy
Complete the first level
You died
Complete the first difficulty mode
Complete the second difficulty mode
Deflect a bullet
Kill a teammate
Buy a mod in survival mode
You have exploded
Buy a weapon in survival mode
Blow up 5 enemies with 1 explosion
Blow up 10 enemies with 1 explosion
Blow up 25 enemies with 1 explosion
Best all the times on every classic mode level
Create some confetti
Unlock an extra
Unlock all extras
Get a kill with a grappled enemy
Put another to sleep after grappling them
Survive 10 waves on map 1
Survive 20 waves on map 1
Survive 10 waves on map 2
Survive 20 waves on map 2
Destroy a bullet with a bigger bullet
Best all the times in the Sneaky difficulty in classic mode level
Deflect a bullet with a frying pan in the rain. "I turned my frying pan, into a dying pan!"
Complete a level with the time extra enabled
Flip a table