Here is the full list of all 22 Men of War: Vietnam achievements.
Complete mission "Vietnamese Connection" on Easy difficulty.
Complete mission "On the Trail of Uncle Ho" on Easy difficulty.
Complete mission "On the Trail of Uncle Ho" on Normal difficulty.
Complete mission "Bon Voyage to Cambodia" on Easy difficulty.
Complete mission "Bon Voyage to Cambodia" on Normal difficulty.
Complete mission "What A Job!" on Easy difficulty.
Complete mission "What A Job!" on Normal difficulty.
Complete mission "Vietnamese Connection" on Normal difficulty.
Complete mission "Happy Tet Day" on Hard difficulty.
Complete campaign "In the Line of Fire" on any difficulty.
Complete mission "Gatecrashers" on Hard difficulty.
Complete mission "Bridge on the River Mekong" on Hard difficulty.
Complete mission "Vietnamese Connection" on Hard difficulty.
Complete mission "Until the trouble troubles you" on any difficulty.
Complete mission "Long Way Home" on Hard difficulty.
Complete campaign "Search and Destroy" on any difficulty.
Complete the game on any difficulty.
Complete mission "Die Hard Attack" on Hard difficulty.
Complete mission "On the Trail of Uncle Ho" on Hard difficulty.
Complete mission "Bon Voyage to Cambodia" on Hard difficulty.
Complete mission "What A Job!" on Hard difficulty.
Complete mission "What A Job!" on any difficulty with minimal losses among civilians.