Here is the full list of all 16 Air Conflicts: Vietnam achievements.
Shoot down 30 players in multiplayer!
Perform 3 kills in row in MP
Place in top half in multiplayer match with at least 6 players
Place first in multiplayer match with at least 6 players
Play 15 multiplayer matches to the end
Complete two missions in Campaign Mode
Shoot down a MiG in campaign mode!
Complete Action 23rd of August!
Rescue an MIA pilot!
Complete the first campaign
Complete Campaign Mode
Reach max rank (Fleet Admiral) with any pilot.
Sink 3 ships in campaign mode
Shot down 50 MiGs in campaign mode
Find A6M Zero crashsite and salvage the airplane!
Find F4U Corsair crashsite and salvage the airplane!