There are 10 Achievements worth 250G for Xbox 360/PC. For PS3, there are 10 Bronze Trophies.
Can I Go Home Now? (15G/Bronze)
Win a round of Rush or Conquest on all four Vietnam levels
Every Gun has a Silver Lining (35G/Bronze)
Get silver stars on all primary Vietnam weapons
A silver star is given after 50 kills.
Ecstasy of Gold (50G/Bronze)
Get gold stars on all primary Vietnam weapons
A gold star is given after 100 kills.
Doing the Rounds (15G/Bronze)
Get a kill with all Vietnam vehicles
You do not need a kill with the Tuk-Tuk, only with the other vehicles that have weaponry.
Cantankerous Chauffeur (25G/Bronze)
Get 100 kills with Vietnam tanks
Ride of the Valkyrie (25G/Bronze)
Get 50 kills with the Huey (UH-1).
Would you kindly STFU? (10G/Bronze)
Destroy a Hannoi Hannah propaganda speaker
There are a number of bullhorn speakers on wood poles around the map. Destroy one to unlock this achievement.
Great Balls of Fire (25G/Bronze)
Get 20 kills with the flamethrower
Just Because I Can (25G/Bronze)
Finish 1st on the scoreboard on any Vietnam level
This is easiest to do on Squad Rush, seeing as how there are few players. You also get a big bonus for destroying the M-COM Stations.
2nd Tour of Duty (25G/Bronze)
Achieve the best squad award on Operation Hastings
Try and find a squad with you and 3 teammates. If you and your squad has the most amount of points while playing on Operation Hastings, you will unlock this achievement/trophy. Squad Rush is the easiest way.