Here is the full list of all 70 Serious Sam HD: The Second Encounter achievements.
Earn gold medals on all Survival levels in single player Survival.
Earn gold medals on all Survival levels in cooperative Survival.
Win 100 Last Team Standing matches with at least 2 players on each team.
Win 100 Team Deathmatches with at least 2 players on each team.
Win 100 Last Man Standing matches with at least 4 players.
Win 100 My Burden matches with at least 3 players.
Win 1000 Deathmatch games.
Win a Team Beast Hunt match on all game levels with least 2 players on each team.
Win 100 Instant Kill matches.
Accumulate a total of 100,001 enemy kills and frags combined.
Win a Beast Hunt match on all game levels.
Win 25 CTF matches with at least 2 players on each team.
Score a total of 100 points in CTF matches.
Win 100 deathmatch games.
Win an at least 4 player Deathmatch by reaching frag limit of at least 25 without dying.
Frag 100 players in a knife-to-knife fight.
Hold the Burden for at least 10 minutes in My Burden match with at least 3 players.
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 25 players with a knife while having no more than 10 health left.
Win 25 1-on-1 Deathmatches.
Frag 100 players with a knife.
Win a Deathmatch Marathon.
Complete 100 Deathmatches.
Complete a Coin-op cooperative game on normal or higher difficulty.
Pick up at least 10 extra life items in Cooperative Coin-op game.
Frag a total of 1337 players.
Pick up 100 gold coins in Coin-op Cooperative game.
Frag 10 players without being killed in at least 4 player Instant Kill match.
Frag a total of 1000 players.
Win a Team Beast Hunt match on any level with least 2 players on each team.
Complete The Grand Cathedral level on serious difficulty without dying or loading.
Frag 100 different players.
Find all secrets in single player.
Earn a round for your team in Last Team Standing game with at least 2 players on each team.
Win one My Burden match with at least 3 players.
Complete the game in single player on serious difficulty.
Frag a total of 500 players.
Frag all players in a single frag combo.
Win one round in Last Man Standing game with at least 4 players.
Win a Beast Hunt match on any level.
Earn at least a bronze medal on any level in cooperative Survival.
Win a CTF match with at least 2 players on each team.
Perform 4 frags with each being no more than 10 seconds apart from the previous frag in at least 4 player Deathmatch.
Frag the same player 5 times in a row in at least 4 player match.
Frag a total of 100 players.
Make at least 3 kills in one Instant Kill match.
Win a Deathmatch.
Frag the same player 10 times during a single round in at least 4 player match.
Complete the game in single player by beating estimated time on each level.
Complete a deathmatch game with at least 1 frag.
Deliver the final blow to Mordekai with the Knife.
Perform 100 rocket jumps.
Find at least 80 secrets in single player.
Kill 1000 enemies with the Laser gun.
Complete the game.
Get all 3 Rocket launchers in Palenque - Sierra de Chiapas.
Complete the Persia episode in single player or cooperative.
Complete the Medieval episode in single player or cooperative.
Complete the South America episode in single player or cooperative.
Kill 100 Harpies with the Sniper rifle.
Find all 3 Cannons in Teotihuacan - The City of the Gods.
Burn 500 enemies to death.
Kill 300 Kleers with the Cannon.
Kill 50 Syrian Werebulls with a knife.
Find a secret under water.
Earn at least a bronze medal on any level in single player Survival.
Complete any level in single player.
Win one Team Deathmatch with at least 2 players on each team.
Complete any level in at least 3 player cooperative game.