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