Here is the full list of all 50 Battlefield: Bad Company achievements worth 1,000 gamerscore.
Got 10002 kills
Achieved all the awards
There is no parachute, right?
Reached Rank 25
Knocked down 1000 trees
Achieved half of all awards
Reached Rank 20
100 kills using vehicle
Collected 50 unique dog tags
Got at least one kill in every vehicle
Played 100 online matches
Completed 'Ghost Town' on hard
Completed 'Crash and Grab' on hard
Climbed to the highest spot in the game
Completed 'Air Force One' on hard
Completed 'Par for the Course' on hard
Found all gold bars
Completed 'Crossing Over' on hard
Completed 'Acta Non Verba' on hard
Completed 'Welcome To Bad Company' on hard
Destroyed 1000 walls
Reached Rank 8
Completed 'Ghost Town' on normal
Found all collectables
Completed 'Crash and Grab' on normal
Hit hostile helicopter with laser designator
Found half of the gold bars
Completed one mission without dying (any difficulty)
Completed 'Air Force One' on normal
Killed 25 enemies in a helicopter
Knocked down a small forest
Used Squad in the menu, found a friend and played one round
Took 3 pictures using the image system
20 Squad members spawned on you and you didn't die!
Placed #1 in a Ranked Match
Collected 5 unique dog tags
Reached Rank 3
Played one complete ranked online match
Completed 'Crossing Over' on normal
Completed 'Par for the Course' on normal
Found half of all collectables
Drove all vehicle types (Jeep, Tank, Heli, Boat)
Destroyed 50 vehicles. (containing enemy AI)
Completed 'Acta Non Verba' on normal
Destroyed 200 Walls
Used auto Injector 50 Times
Found 5 unique collectables
Found one gold bar
Completed 'Welcome To Bad Company' on normal
Killed 25 enemies