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 all co-op missions on Hard
Reached the VIP without setting off the alarm in Exfiltration
Reached the garage without going into man-down state in Hit and Run
Received all 3 vehicle warfare ribbons
Completed the mission without losing a humvee in Operation Exodus
Rank 45 achieved!
Received all 4 support efficiency ribbons
Received all 4 weapon efficiency ribbons
Unlocked all unique co-op weapons
MVP in a ranked match
Completed all co-op missions
Disarmed the bomb in under 20 seconds in The Eleventh Hour
Completed the mission without using the fire extinguisher in Fire From The Sky
Completed the campaign story
Beat Solomon, flawlessly, in The Great Destroyer
Captured Kaffarov
Headshot each of the targets in the gun range in Kaffarov
2nd MVP in a ranked match
3rd MVP in a ranked match
Took your first enemy Dog Tag
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
Kicked the car and killed the soldiers in Uprising
Survived the quake
Protected Chaffin from the soldiers in the street in Operation Swordbreaker
Completed Semper Fidelis
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
Take a russian Dog Tag in the forest ambush in Rock And A Hard Place
Complete Going Hunting in a perfect run
Take down the jet in one attempt in Rock And A Hard Place
Complete the campaign story on Hard
Reach and save the hostages without alerting any enemies in Drop 'em Like Liquid
Obtain one of each ribbon in the game
Got 10 kills with each of the ten Back to Karkand weapons
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 a kill with the skid loader
Got 10 kills with all ten CQ weapons
Fell over the edge on Ziba Tower
Without dying, got a kill with a Carbine, Pistol and Rocket Launcher
Completed a round of Gun Master
Won a round in Conquest Domination
Got 10 kills each with Tank destroyers and Mobile Artilleries
Won one round of Tank Superiority
Got one kill with the Quad bike
Destroyed the Gunship
Got one kill with the Gunship
Without dying, got a kill with xbow, primary weapon, and hand grenade
Unlocked all xbow parts
Destroyed an enemy vehicle using the xbow
Found the secret reptile
Picked up 50 weapons in Scavenger mode
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