Obtain the "Silent But Deadly" achievement effortlessly.
Find any level with a grunt or two sleeping, or even an enemy around that can be easily assassinated from behind without alerting anyone around (This enemy should preferably be right after a checkpoint). After you've done this, assassinate them. Be sure to hit the enemy with the reticule not directly on the enemy, as there is no chance for the enemy to fire a few shots off while dying and alerting others nearby. Once you've successfully killed the enemy/enemies, reload to the last checkpoint. From there, just find those enemies again and kill them as before. Keep doing this until you get the achievement, but without getting caught in between loads.
It seems that the game has a glitch, which doesn't reset the "kills without being caught" meter at every reload. May as well exploit it.
Contributed By: halo824.
Complete the following tasks to earn the desired achievement. Note that these only work on the PC version; they will NOT work in the Xbox version.
|Unlockable||How to Unlock|
|Complete each level (seperate achievements) on Normal, Heroic, or Legendary. There are 13 levels (not counting tutorial) for a total of 390 points.||(Campaign level goes here) (30 each)|
|Blow up the Banshee in flight while manned, with grenades or the rocket launcher||Air Traffic Control (20)|
|Melee an opponent from behind||Assassin (10)|
|Hit and kill an opponent from behind||Bonecracker (10)|
|Steal an occupied vehicle from an opponent and take it over||Carjacking (5)|
|Kill the sword carrier||Counterpoint (5)|
|Get awarded at least 8 different medals in one non-team game||Decorated Soldier (10)|
|Complete any level without dying. The tutorial level does not count.||Demon (25)|
|Kill 2 opponents within 4 seconds||Double Kill (20)|
|Kill an enraged, berserk Brute by melee||Go Ape Shiv (20)|
|Complete the game on Heroic difficulty||Hero (50)|
|If you know someone in the game who has completed the game on Legendary, then kill him.||Hired Gun (20)|
|Kill 5 opponents in a row in the same game, without dying||Killing Spree (20)|
|4 opponents||Killtacular (20)|
|Aquire the Scrab gun on the Metropolis level||King of the Scrab (20)|
|Complete the game on Legendary difficulty||Legend (50)|
|In a non-team game, kill 5 people by melee, from behind||Ninja (20)|
|Play every game variant, with at least 3 other players, until the end of the game||Rainman (25)|
|Run over, hit and kill an opponent with a vehicle||Roadkill (10)|
|10 opponents, same condition||Running Riot (20)|
|Kill the sword carrier, after he/she has killed 5 or more opponents in a row with the sword||Skewer Stopper (20)|
|Kill 7 enemies in a row without being spotted||Slient but Deadly (20)|
|Stick an opponent (MP) with a plasma grenade and blow them up||Stick It (5)|
|3 opponents||Triple Kill (20)|
|End someone's killing spree.||Vigilante (10)|
|Play every default map and stay in the game until it's over||Violent Cartographer (25)|
|Complete the game on Normal difficulty||Warrior (100)|
Contributed By: tjoeb123.