Here is the full list of all 24 Penarium achievements.
Smash 150 barrels in a single arcade game in any arena.
Collect all 14 cards.
Have 5000 coins in your wallet.
Smash 100 barrels in a single arcade game in any arena.
die 1000 times.
Collect 10 cards.
Die 250 times.
Have 2500 coins in your wallet.
Collect 6 cards.
Have 1000 coins in your wallet.
Smash 50 barrels in a single arcade game in any arena.
Have 500 coins in your wallet.
Smash 20 barrels in a single arcade game in any arena.
Complete the third arena in campaign mode.
Beat the boulder madness challenge in the campaign mode.
Die 50 times.
Complete the second arena in campaign mode.
Die by a direct hit from an icicle while in mid air.
Beat the Dragon's Nest challenge in campaign mode.
Die 15 times.
Complete the first arena in campaign mode.
Beat the first balloon challenge in the campaign mode.
Die 5 times.
Beat the first cauldrons challenge in the campaign mode.