Here is the full list of all 25 Snake Force achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Finished Level 1
Killed an enemy for the first time.
Embraced the death for the first time.
Completed a level with four members in the team.
Having ten bros in your team.
Killed 10 hostages.
Killed all bros after finishing a level.
Finished the game.
Completed a level with 8 members in the team.
Killed exactly 4 units with one barrel explosion.
Finished the Badass mode.
Killed 20 friendly bros.
Killed 50 enemies.
Killed 100 enemies.
Killed by an explosion.
Finished Level 2
Finished Level 3
Finished Level 4
Finished Level 5
Rescue 50 bros.
Complete a level without killing any enemy.
Finished First Person Mode
Finish the Badass Mode or First Person Mode with the Suit Man.
Defeat The ?
Finish the Badass Mode or First Person Mode with the ?