Here is the full list of all 12 Kitten Rampage achievements.
Touch the sky box and land safely!
Complete Agents Hideout (time trial)
Gain a total of 1,000,000 Score (must complete level to earn score)
Kill 5 enemy agents
Reach 145,000 Score in one match!
Poop 150 times in one match
Reach 99,999 Score in one match!
Poop 50 times in one match
Poop 25 times in one match
Reach 25,000 Score!
Poop a whopping 1,000,000 times! (must complete level to save poop)
Destroy a total of 100,000 props!