Full list of all 77 Sniper Elite 3 achievements. It takes around 60-80 hours to unlock all of the achievements in the base game on Windows.
The base game contains 51 achievements, and there are 6 DLC packs containing 26 achievements.
Hold breath for one hour
Kill 10 enemies with flint-triggered detonations
Attain a rank of Second Lieutenant (level 31)
Complete 100% of the campaign on any difficulty
Complete all the optional objectives
Tag 100 enemies or vehicles
Find all the collectible cards
Find all the war diaries
Complete all the long shots
Find all the Sniper nests
Throw an enemy off one of the bridges (Mission 8)
Destroy all 3 bomb dumps at the same time (Mission 7)
Incapacitate 2 vehicles in Kasserine Pass within 5 seconds (Mission 6)
Complete a campaign mission without being seen (excluding Tobruk)
Make the target officer's death look like an accident (Mission 5)
Snipe enemies over a cumulative distance of a double marathon
Get to the informant without being spotted (Mission 4)
Own Sniper Elite, Sniper Elite V2 and Sniper Elite 3
Find half of the war diaries
Find and kill the visiting General (Mission 3)
Play 10 competitive multiplayer matches
Create and save 4 loadouts
Earn 1 of every ribbon in competitive multiplayer
Complete all the challenge missions
Play 1 mission in each mode (campaign, challenges, competitive multiplayer)
Get 20 chain reaction explosive kills
Kill 20 enemies by shooting explosives
Hide a body in each of the wells in Gaberoun (Mission 2)
Clear the mountain pass without alerting the enemy (Mission 1)
Distract 20 enemies with flint or rocks
Complete the game on Marksman difficulty
Complete the game on Sniper Elite difficulty
Complete the game on Authentic difficulty
Get 30 kills from sniper nests
Kill 10 snipers before they see/shoot you
Get a testicle-shot from over 100m away
Relocate 100 times
Attain a rank of Sergeant (level 11)
Complete Mission 8
Complete the campaign in co-op
Complete the game on Cadet difficulty
Complete Mission 7
Complete Mission 6
Get a kill with each offensive item
Complete Mission 5
Complete Mission 4
Complete Mission 3
Complete a mission after losing over 500 units of health
Customize 1 rifle
Complete Mission 2
Complete Mission 1
Kill the target with a grenade
Kill the target in 7 different ways
Kill the target by shooting nearby explosive barrels
Kill the target in the vehicle by shooting its weakspot
Kill the target with a chain reaction
Crush the target with a bell
Kill the officer at the meeting with a testicle shot
Shoot and kill the target
Observe the target and correctly choose to leave or kill
Shoot the target in his car
Complete 'In Shadows'
Complete the mission without using any healing items
Get to the command tent unseen and without killing
Destroy all the Teufelsfeuer shipments in the truck depot.
Complete 'Belly of the beast'.
Hit all the targets on the shooting range.
Kill the Teufelsfeuer soldiers in the coliseum.
Complete 'Confrontation'.
Spot and destroy 4 enemy traps without triggering them.
Eliminate a sniper with a stealth takedown.
Blow up the soldier in the distant tower using heavy artillery.
Snipe the soldier in the tower far, far away.
Take out two of the AA gun crews with special explosive events.
Find and set up the MG42.
Find and shoot the 10 hidden explosives (Shooting Range).
Earn Gold on all ranges (Shooting Range).