Here is the full list of all 9 Meaty McSkinBones achievements. It takes around 0-1 hour to unlock all of the achievements.
McSkin died in a pool of melted cheese
Bones died for the first time
Completed the first level
Performed the parachute interaction for the first time
Launched the game for the first time
A block of cheese fell on top of and killed Bones
Performed the bonemerang interaction for the first time
Performed the ladder interaction for the first time
Meaty died in a pool of melted cheese