Here is the full list of all 16 Air Conflicts: Vietnam achievements.
Complete the first campaign
Sink 3 ships in campaign mode
Complete two missions in Campaign Mode
Shoot down a MiG in campaign mode!
Complete Action 23rd of August!
Rescue an MIA pilot!
Complete Campaign Mode
Shoot down 30 players in multiplayer!
Reach max rank (Fleet Admiral) with any pilot.
Shot down 50 MiGs in campaign mode
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
Find A6M Zero crashsite and salvage the airplane!
Find F4U Corsair crashsite and salvage the airplane!