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