Here is the full list of all 40 Mousey achievements.
Collect all the required cheese in "Kitchen".
Complete the training level.
Beat the game.
Collect 2000 cheese.
Collect 15 hidden TWEP-coins.
Destroy 200 cheese boxes.
Consume 20 peppers.
Get shocked by a hazardous fork in the kitchen.
Take a plunge in orange juice.
Reach 100% completion.
Reach the treasure in less than 8 minutes.
Collect 250 cheese.
Collect 1000 cheese.
Collect all the required cheese in "Living Room".
Collect all the required cheese in "Bedroom".
Spend at least 10 seconds on a stinky slice of cheese.
Find all the secret film reels.
Collect all the required cheese in "Bathroom".
Collect all the required cheese in "Playroom".
Defeat 100 bugs.
Beat a developer time in a Loot Race.
Enter 10 donuts.
Get a gold or higher medal in all the main Loot Races.
Find all the jack-o tokens in Halloween Pack.
Find all the donut tokens in the main levels.
Find all the chocolate chip cookies in the main levels.
Defeat 15 spinning top enemies.
Find all the snowman heads in The Snowglobe.
Use a mouse hole shortcut 30 times.
Beat a developer time in a biplane challenge.
Repair the biplane 30 times.
Reach 100% completion in Halloween Pack.
Collect all the "24" tokens in Laser Cosmos.
Reach 100% completion in Laser Cosmos.
Unlock Circus Trials.
Find all the jester hat tokens in Circus Trials.
Reach 100% completion in Circus Trials.
Beat Circuit Circus without taking damage.
Create and playtest a custom level with at least 10 cheese.
Purchase something from the Shop.