Here is the full list of all 131 Blockstorm achievements.
You were the first to be killed during a match
Airborne killed an airborne enemy, like a flying doll with foam wings
You killed an enemy that was reloading
You have been the most valuable player once
You have captured 3 flags in succession
You killed someone when you were in air
You killed an enemy with the last ammo in magazine (except Sniper)
You have killed 1 enemy
You played skeet shooting with an enemy
You have seen the credits' page
You have killed 50 enemies
You have killed 100 enemies
You have killed 250 enemies
You have killed 500 enemies
You have killed 1000 enemies
You have killed 2500 enemies
You have killed 5000 enemies
You have killed 10000 enemies
You have killed 20 enemies in a single match
You have killed 30 enemies in a single match
You have killed 40 enemies in a single match
You have killed 50 enemies in a single match
You have killed 60 enemies in a single match
You have been the most valuable player 10 times
You have been the most valuable player 50 times
You have been the most valuable player 100 times
Killed 3 enemies in less than 10 seconds using guns
Killed 4 enemies in less than 10 seconds using guns
Killed 5 enemies in less than 10 seconds using guns
Killed 2 enemies at once using C4
Killed 3 enemies at once using C4
Killed 4 enemies at once using C4
Killed 2 enemies at once using grenades
Killed 3 enemies at once using grenades
Killed 4 enemies at once using grenades
Killed 2 enemies at once using RPG
Killed 3 enemies at once using RPG
Killed 4 enemies at once using RPG
You have killed 50 enemies using Rifle
You have killed 100 enemies using Rifle
You have killed 250 enemies using Rifle
You have killed 500 enemies using Rifle
You have killed 50 enemies using AK47
You have killed 100 enemies using AK47
You have killed 250 enemies using AK47
You have killed 500 enemies using AK47
You have killed 50 enemies using MP5
You have killed 100 enemies using MP5
You have killed 250 enemies using MP5
You have killed 500 enemies using MP5
You have killed 50 enemies using Shotgun
You have killed 100 enemies using Shotgun
You have killed 250 enemies using Shotgun
You have killed 500 enemies using Shotgun
You have killed 50 enemies using M240
You have killed 100 enemies using M240
You have killed 250 enemies using M240
You have killed 500 enemies using M240
You have killed 25 enemies using Sniper
You have killed 50 enemies using Sniper
You have killed 100 enemies using Sniper
You have killed 250 enemies using Sniper
You have killed 10 enemies using C4
You have killed 25 enemies using C4
You have killed 50 enemies using C4
You have killed 100 enemies using C4
You have killed 10 enemies using Claymore
You have killed 25 enemies using Claymore
You have killed 50 enemies using Claymore
You have killed 100 enemies using Claymore
You have killed 25 enemies using Grenade
You have killed 50 enemies using Grenade
You have killed 100 enemies using Grenade
You have killed 250 enemies using Grenade
You have killed 10 enemies using RPG
You have killed 25 enemies using RPG
You have killed 50 enemies using RPG
You have killed 100 enemies using RPG
You have killed 50 enemies using Knife
You have killed 100 enemies using Knife
You have killed 250 enemies using Knife
You have killed 500 enemies using Knife
You have won 10 Assault matches
You have won 25 Assault matches
You have won 50 Assault matches
You have won 100 Assault matches
You have won 10 Capture The Flag matches
You have won 25 Capture The Flag matches
You have won 50 Capture The Flag matches
You have won 100 Capture The Flag matches
You have won 25 Team Deathmatch matches
You have won 50 Team Deathmatch matches
You have won 100 Team Deathmatch matches
You have won 250 Team Deathmatch matches
Quit during the match just after dying
You have committed suicide 100 times
You have captured 10 flags
You have captured 25 flag
You have captured 50 flags
You have captured 100 flags
You have returned 10 flags
You have returned 25 flags
You have returned 50 flags
You have returned 100 flags
You have captured 5 flags in succession
You have captured 7 flags in succession
Your grenade killed someone when you were dead
You were the first to kill an enemy during a match
You have won 10 Castle Battle matches
You have won 25 Castle Battle matches
You have won 50 Castle Battle matches
You have won 100 Castle Battle matches
You have looted 10 chests
You have looted 25 chests
You have looted 50 chests
You have looted 100 chests
You have destroyed 5 thrones
You have destroyed 10 thrones
You have destroyed 25 thrones
You have destroyed 50 thrones
You have looted 3 chests in the same match
You have looted 5 chests in the same match
You have looted 7 chests in the same match
You have won 10 Hunt matches
You have won 25 Hunt matches
You have won 50 Hunt matches
You have won 100 Hunt matches
You have collected 100 Blocktanium atoms
You have collected 250 Blocktanium atoms
You have collected 500 Blocktanium atoms
You have collected 1000 Blocktanium atoms