Here is the full list of all 18 12 bananas achievements.
because the mountain wasn't enough
hungry mice are a force to be reckoned with, and sometimes, they are inevitable
phew can someone please turn on the AC in here
you flew, you soared, you conquered
scale that mountain! plain and simple
you're not supposed to be here, but you got up here somehow
easy to miss but this one didn't fool you
who says bananas can't swim?
because you can't just hastily jump down holes
you don't need to see the floor to succeed
bounce your way to victory
fortune and glory, kid. fortune and glory
get a grip, brave the cold
escape the castle, claim the banana
face your fears, ascend into the heavens
collect all 12 bananas without losing a single life after collecting the 11th banana
collect all 12 bananas. plain and simple
collect all 12 bananas in 20 minutes or less