Full list of all 63 Battlefield 3 achievements worth 1,600 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game.
The base game contains 38 achievements worth 1,000 Gamerscore, and there are 5 DLC packs containing 25 achievements worth 600 Gamerscore.
Protected Chaffin from the soldiers in the street in Operation Swordbreaker
Failed to prevent the attack
Found the nuke
Survived the quake
Captured Al Bashir
Shot out the 4 lights with 4 bullets in Night Shift
Captured Kaffarov
Took down 2 enemies with 1 bullet in Night Shift
Completed Semper Fidelis
Completed the campaign story
Beat Solomon, flawlessly, in The Great Destroyer
Kill the 2 soldiers before the building falls on them in Uprising
Complete the street chase in Comrades in under 2 minutes 30 seconds without dying
Headshot each of the targets in the gun range in Kaffarov
Take a russian Dog Tag in the forest ambush in Rock And A Hard Place
Kick the car to kill the soldiers in Uprising
Complete Going Hunting in a perfect run
Destroy 6 enemy tanks before reaching the fort in Thunder Run
Take down the jet in one attempt in Rock And A Hard Place
Complete the campaign story on Hard
Reach the garage without going into man-down state in Hit and Run
Complete all co-op missions
Unlock all unique co-op weapons
Complete the mission without losing a humvee in Operation Exodus
Disarm the bomb in under 20 seconds in The Eleventh Hour
Reach and save the hostages without alerting any enemies in Drop 'em Like Liquid
Complete the mission without using the fire extinguisher in Fire From The Sky
Complete all co-op missions on Hard
Reach the VIP without setting off the alarm in Exfiltration
Obtain all 3 vehicle warfare ribbons
Obtain all 4 weapon efficiency ribbons
Obtain one of each ribbon in the game
Finish as 3rd MVP in a ranked match
Obtain all 4 support efficiency ribbons
Achieve rank 45
Finish as 2nd MVP in a ranked match
Finish as MVP in a ranked match
Obtain your first enemy Dog Tag
Get a kill with the following weapons in a single life: Assault Rifle, Jet, Tank
Get a kill with each of the following vehicles: the BTR-90, DPV and F-35.
Get 10 kills with each of the ten Back to Karkand weapons
Get a kill with the skid loader
Take a swim in the Oman Hotel swimming pool
Win a round in Conquest Domination
Without dying, get a kill with a Carbine, Pistol and Rocket Launcher
Fall over the edge on Ziba Tower
Get 10 kills with all ten CQ weapons
Complete a round of Gun Master
Get one kill with the Gunship
Get 10 kills each with Tank destroyers and Mobile Artilleries
Get one kill with the Quad bike
Win one round of Tank Superiority
Destroy the Gunship
Unlock all xbow parts
Find the secret reptile
Destroy an enemy vehicle using the xbow
Without dying, get a kill with xbow, primary weapon, and hand grenade
Pick up 50 weapons in Scavenger mode
Transport a flag carrier in an air vehicle in CTF
Capture one flag while playing CTF
Get a kill from the passenger position on a motorcycle
Destroy an air vehicle using the AA jeeps
Kill an enemy after successfully paradropping a vehicle