Here is the full list of all 43 Sniper Ghost Warrior Contracts 2 achievements.
Kill Antwana Zarza while he is in a vehicle
Complete Rashida Qalat at the Highest Difficulty in a single playthrough
Buy 54 skills
Complete The Tajmid Heights at the Highest Difficulty in a single playthrough
Kill any contract target using your drone's poison rifle
Kill 5 enemies while holding your breath with Stamina Booster active
Kill Taj Taheer in the car with a headshot
Kill everyone from all of the reinforcement waves during the Oil Field contract
Kill Ronald Payne after he takes up a sniping position
Kill 2 enemies with a grenade
Complete Maladh Wadi at the Highest Difficulty in a single playthrough
Kill each Suspect with a single bullet, hitting the body, during the alarm
Complete Mount Kuamar at the Highest Difficulty in a single playthrough
Finish a Contract using only sniper rifles
Kill Novikov while he's inspecting a damaged Antenna
Complete Zindah Province at the Highest Difficulty in a single playthrough
Unlock all Sniper Rifles
Find all of the Collectibles
Complete Maladh Wadi
Complete all Mission Contracts
Kill the Target and the other Suspects without raising the alarm
Unlock all Secondary Weapons
Complete Rashida Qalat
Kill 5 enemies in the same mission using the Sentry Turret
Retrieve the security chips without killing Bibi
Unlock all Sidearms
Complete The Tajmid Heights
Finish all Contracts in a Region without ever taking damage from enemies
Provoke both targets to escape and kill them before they do so
Lead the prisoner to safety without raising the alarm
Kill 5 enemies in 1 minute without raising the alarm
Complete Mount Kuamar
Escape the Server Room ambush without being detected
Kill at least 1 of each enemy type in the same mission
Unlock 1 Weapon
Complete Zindah Province
Complete a contract when every time you hit the enemy is a kill
Land a shot from over 1300m away
Kill 2 enemies using an explosion
Find your first Collectible
Kill 2 enemies with the same bullet
Be within 2 meters of an enemy for 10 seconds without being detected
Buy your first skill