Full list of all 35 Serious Sam HD: The First Encounter achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Frag 100 different players in deathmatch.
Win an at least 4 player deathmatch by reaching frag limit of at least 25 without dying.
Frag all players in a single frag combo.
Frag the same player 5 times in a row in at least 4 player deathmatch.
Perform 4 frags with each being no more than 10 seconds apart from the previous frag in at least 4 player deathmatch.
Complete the game in single player without firing a single bullet or shell.
Kill all enemies in Karnak in single player.
Complete the game in single player by beating estimated time on each level.
Complete the game in single player on serious difficulty.
Complete Metropolis level in single player on serious difficulty without loading.
Pierce at least 10 enemies with a single cannonball.
Find at least 50 secrets in single player.
Perform 100 rocket jumps.
Win 1000 deathmatch games.
Complete the game.
Complete a co-op game on serious difficulty and extra enemy strength on 400%.
Complete any level in single player.
Win 25 1-on-1 deathmatches.
Frag a total of 1337 players.
Frag a total of 1000 players.
Drown an enemy.
Frag a total of 500 players.
Win 100 deathmatch games.
Win a deathmatch marathon.
Complete a deathmatch with frag limit set to at least 200. (Frag limit must be reached!)
Frag 100 players with a knife from behind.
Frag 100 players with a knife.
Frag 100 players in a knife-to-knife fight.
Frag a total of 100 players.
Frag the same player 10 times during a single round in at least 4 player deathmatch.
Complete 100 deathmatches.
Frag 25 players with a knife while having no more than 10 health left.
Win a deathmatch.
Complete The Great Pyramid in co-op with blood option set to hippy.
Complete any level in co-op.