Here is the full list of all 20 MC Lars: The Video Game achievements.
Complete the fifth level.
Complete the fourth level.
Complete the third level.
Clear out your data and start from scratch.
Complete the second level.
Complete the first level.
Complete the tutorial level.
Complete the sixth level.
Complete the seventh level.
Complete the eighth level.
Complete the ninth level.
Complete the tenth level.
Complete the eleventh level.
Complete the final level.
Earn all 3 stars in a single level.
Earn 3 stars in a level as The One.
Earn 3 stars in a level as Emo Lars.
Earn 3 stars in a level as T-Rex Lars.
Earn all 12 stars in a single world.
Earn all 36 stars in all 3 worlds.