Here is the full list of all 61 Meow Defence achievements.
Get 100 Meow Coins
Get 1000 Meow Coins
Get 5000 Meow Coins
Buy 1 Upgrade
Buy 5 Upgrades
Buy 10 Upgrades
Buy 20 Upgrades
Reach Level 10
Reach Level 20
Destroy 100 bricks
Destroy 1000 bricks
Destroy 10000 bricks
Destroy 100000 bricks
Destroy one Boss
Destroy 10 Bosses
Destroy 100 Bosses
Destroy 1000 Bosses
Get 1000 coins from cat litter chest
Get 5000 coins from cat litter chest
Nice! A Heavy Cat Litter Chest!
Nice! 100 Full Cat Litter Chests!
Nice! 234 Cat Litter Chests with with strange smell!
Guard the cat for 3 minutes in a single run
Guard the cat for 15 minutes in a single run
Guard the cat for 10 minutes in "First Landing" map
Guard the cat for 10 minutes in "Fault" map
Guard the cat for 10 minutes in "Cave" map
Rescued one cat in "First Landing" map
Rescued one cat in "First Landing" map on Fast mode
Rescued one cat in "First Landing" map on Hard mode
Rescued one cat in "Fault" map
Rescued one cat in "Fault" map on Fast mode
Rescued one cat in "Fault" map on Hard mode
Rescued one cat in "Cave" map
Rescued one cat in "Cave" map on Fast mode
Rescued one cat in "Cave" map on Hard mode
Guard the cat with USS Toilet Paper for 15 minutes
Guard the cat with USS Carton for 15 minutes
Guard the cat with USS Keyboard for 15 minutes
Guard the cat with USS Roomba for 15 minutes
Get the Bounce Ball to max level
Get the Frisbee to max level
Get the Balloon to max level
Get the Heater to max level
Get the Clockworks Mouse to max level
Get the Laser Pointer to max level
Get the Static Electricity to max level
Get the Spilled Coffee to max level
Get the Football to max level
Get the Battery to max level
Get the Charger to max level
Get the Chips to max level
Get the Chocolate to max level
Get the Hair Dryer to max level
Get the Table Lamp to max level
Get the Remote Control to max level
Get the Cora to max level
Get the Fish Tank to max level
Get the Poker to max level
Get the Cup to max level
Get the Piggy Bank to max level