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.
Completed Semper Fidelis
Kicked the car and killed the soldiers in Uprising
Completed the street chase in Comrades in under 2 minutes 30 seconds without dying
Killed the 2 soldiers before the building fell on them in Uprising
Took a Russian Dog Tag in the forest ambush in Rock And A Hard Place
Received all 4 weapon efficiency ribbons
Received all 4 support efficiency ribbons
Completed the campaign story
Completed the campaign story on Hard
Beat Solomon, flawlessly, in The Great Destroyer
Captured Kaffarov
Took down the jet in one attempt in Rock And A Hard Place
Captured Al Bashir
Took down 2 enemies with 1 bullet in Night Shift
Shot out the 4 lights with 4 bullets in Night Shift
Destroyed 6 enemy tanks before reaching the fort in Thunder Run
Failed to prevent the attack
Found the nuke
Completed all co-op missions
Completed all co-op missions on Hard
Unlocked all unique co-op weapons
Disarmed the bomb in under 20 seconds in The Eleventh Hour
Survived the quake
2nd MVP in a ranked match
3rd MVP in a ranked match
Reached the VIP without setting off the alarm in Exfiltration
Completed the mission without using the fire extinguisher in Fire From The Sky
MVP in a ranked match
Took your first enemy Dog Tag
Protect Chaffin from the soldiers in the street in Operation Swordbreaker
Headshot each of the targets in the gun range in Kaffarov
Complete Going Hunting in a perfect run
Reach the garage without going into man-down state in Hit and Run
Complete the mission without losing a humvee in Operation Exodus
Reach and save the hostages without alerting any enemies in Drop 'em Like Liquid
Obtain all 3 vehicle warfare ribbons
Obtain one of each ribbon in the game
Achieve rank 45
Took a swim in the Oman Hotel swimming pool
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
Won a round in Conquest Domination
Fell over the edge on Ziba Tower
Completed a round of Gun Master
Without dying, got a kill with a Carbine, Pistol and Rocket Launcher
Get 10 kills with all ten CQ weapons
Won one round of Tank Superiority
Destroyed the Gunship
Got one kill with the Gunship
Got one kill with the Quad bike
Get 10 kills each with Tank destroyers and Mobile Artilleries
Picked up 50 weapons in Scavenger mode
Destroyed an enemy vehicle using the xbow
Unlock all xbow parts
Find the secret reptile
Without dying, get a kill with xbow, primary weapon, and hand grenade
Captured one flag while playing CTF
Destroyed an air vehicle using the AA jeeps
Got a kill from the passenger position on a motorcycle
Transport a flag carrier in an air vehicle in CTF
Kill an enemy after successfully paradropping a vehicle