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