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