Here is the full list of all 30 My Friend Pedro (Windows) achievements worth 1,000 gamerscore.
Get S-rating on 10 levels
Kill 2000 enemies
Kick enemies 100 times
Flip 10 tables
Get a 50x combo
Complete a level without firing a weapon
Kill at least 3 enemies with one explosion
Get an S-rating
Finish the game
Finish chapter "The Internet"
Dodge 1000 bullets
Finish chapter "The Sewer"
Kick a skateboard in to the face of an enemy
Kill 1000 enemies
Break 100 crates
Finish chapter "Pedro's World"
Finish chapter "District Null"
Jump through 10 windows
Kill enemy by ricocheting bullet off frying pan
Kick a frying pan in to the face of an enemy
Kill 500 enemies
Finish chapter "Old Town"
Stick a knife in to an enemy
Kick a Gas Canister in to the face of an enemy
Get a 20x combo
Juggle basketball 10 times without it touching anything
Kill an enemy using a barrel
Get a 10x combo
Get S-rating on 25 levels
Get S-rating on all levels