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