Here is the full list of all 21 World In Danger achievements.
Earn all codenames / achievements
Get S-rank in Boss Attack Mode
Finished Boss Attack Mode on Ironman setting
Find and rescue all 7 smuggled animals hiding in various levels
Complete a mission with every playable character
Beat a boss mission using only a handgun
Get S-Rank for every mission
Completed all story missions
Defeated R.A.P.T.O.R.
Defeated Super powered duo
Defeated the traitorous recruit and his airsupport
Defeated Blaser
Fought againts Sako
Get S-Rank on a boss mission
Defeated Red Wolf
Defeated Miss Dynomite
Defeated Machine-gun Ali
Listen to all conversations in free-roam mode
Speak to every person in free-roam mode once
Find Marco’s hiding spot 5 times in free-roam mode
Get S-Rank on a single mission