Full list of all 24 Sniper: Ghost Warrior achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox 360.
Collected all secrets.
30 enemies killed with browning gun.
5 High-Voltage cable lines broken.
Finished game on Normal difficulty.
Finished game on Hard difficulty.
Act IV Completed.
Finished game on Easy difficulty.
10 enemies killed with throwing knives.
Act III Completed.
Act II Completed.
2 enemies killed with one shot.
100 headshots delivered.
All enemies on riverside in "Weaken The Regime" level killed.
Act I Completed.
2 enemies killed with one grenade.
50 headshots delivered.
Enemy killed by the wall.
15 enemies killed in concentration mode.
10 birds killed.
Kill 250 people using pistol.(Multiplayer)
Kill 250 people using sniper rifle.(Multiplayer)
Kill 500 people using sniper rifle.(Multiplayer)
Kill 2000 people.(Multiplayer)
Win 50 rounds playing online.(Multiplayer)