Here is the full list of all 30 My Friend Pedro achievements.
Get a 10x combo
Break 100 crates
Jump through 10 windows
Kill at least 3 enemies with one explosion
Get a 20x combo
Get a 50x combo
Kick a frying pan in to the face of an enemy
Kick a skateboard in to the face of an enemy
Kick a Gas Canister in to the face of an enemy
Stick a knife in to an enemy
Kill enemy by ricocheting bullet off frying pan
Juggle basketball 10 times without it touching anything
Kill an enemy using a barrel
Flip 10 tables
Dodge 1000 bullets
Kick enemies 100 times
Kill 500 enemies
Kill 1000 enemies
Kill 2000 enemies
Get an S-rating
Get S-rating on 10 levels
Get S-rating on 25 levels
Get S-rating on all levels
Complete a level without firing a weapon
Finish chapter "Old Town"
Finish chapter "District Null"
Finish chapter "Pedro's World"
Finish chapter "The Sewer"
Finish chapter "The Internet"
Finish the game