Here is the full list of all 27 Paintball War achievements.
Get 2 rank
Get the 3 rd title
Get the 4th rank
Get 5 rank
Get 6 rank
Get the 7th rank
Get the 8th rank
Get the 9th rank
Get the 10th rank
Get the 11th rank
Get the 12th rank
Get the 13th rank
Get the 14th rank
Get the 15th rank
Kill 50 enemies
Kill 200 enemies
Kill 500 enemies
Kill 1000 enemies
Winning 50 matches
Win in 200 games
Winning 500 games
Die 500 times