Here is the full list of all 15 Mec Me Loffa achievements.
Defeat 10 Wakakas
Defeat 100 Wakakas
Defeat 500 Wakakas
Entraaa? Non penso proprio!!
Defeat the last wave using only one sword hit
Get killed by the Trapezio
Jump on 20 mushrooms
Jump on 100 mushrooms
Defeat every wakaka before finishing the MEC
Defeat the MEC with a Slap!
Spend a total of 2 minutes in the lava
Win in under 12 minutes
Nooo! Telecamera? No no no no
Watch Roberto fall to pieces
Jump close to the ceiling