Here is the full list of all 21 Narco Terror achievements.
Get to South America
Complete any mission without dying
Destroy 5 ground enemies with your aircraft
Complete Mission 01
Kill 20 enemies with grenades
Kill 150 enemies
Kill 6 enemies with a single grenade
Play Co-Op mode for 5 minutes
Upgrade a weapon
Destroy 50 vehicles
Upgrade all weapons
Find 5 collectables
Find all the collectables
Complete the game on any difficulty
Complete the game on hardcore difficulty
Melee kill 10 enemies
Kill 3,000 enemies in total
Complete a vehicle minigame without getting hit
Meet Delgado for the first time
Earn 15,000 dollars
Use all special ammo and weapons