Here is the full list of all 16 8-Bit Fiesta achievements.
Kill Schwinghammer
Beat story mode lvl 1
Crush the clown
Drown the dog
You have no fear of death
Speedrun a gold time
Finish 10 tournaments
Unlock 3 characters in storymode
Beat the first boss in no death run
Oh beer god what happened?
Please don't become a pilot
Beat world 2 in no death run
Beat all levels in no death run
Unlock all characters
Beat Jesus in wolly bomb
Kill the dictator