Full list of all 18 UltraGoodness 2 achievements worth 1,000 gamerscore. It takes around 0.5-1 hour to unlock all of the achievements on Xbox One.
Complete level 7.
Complete level 6.
Complete level 5.
Complete level 4.
Kill 750 enemies.
Complete level 3.
Kill 500 enemies.
Buy any cat upgrade.
Preform an UltraViolence kill combo.
Kill 250 enemies.
Complete level 2.
Kill 100 enemies.
Kill 50 enemies.
Kill 25 enemies.
Complete level 1.
Preform a Deadly kill combo.
Preform a Cruel kill combo.
Preform a Brutal kill combos.