All you need to do is pick it up and throw it over the wall at the Infected without opening the door. A perfect instance to do this is the start of Dead Air where there is a Pipe bomb on the table. This achievement should be attempted in finales or Crescendo Events, as at those times there are a lot of Infected in large groups.

You can fulfill this achievement either by throwing a pipe bomb or by blowing up explosives.

Also throw a Pipe bomb if you enter a large area filled with idle Infected.

Throw a pipe bomb when you see a large horde approaching, such as a panic event.

Another easy way to obtain achievements is to create a server in order to exploit the console commands.īlow up 20 Infected in a single explosion. Note: Since the Crash Course update, achievements cannot be earned with cheats turned on ( sv_cheats = 1), however, one way is to play on Versus mode with everyone helping each other to get achievements.

A PC-exclusive achievement titled Gnome Alone was added to Left 4 Dead 2 in late November 2020.

The Last Stand Community Update adds 30 new achievements to Left 4 Dead 2.

The achievement Good Guy Nick is achieved by surviving a campaign with players who obtained their copy of game during free weekend.

A special holiday-themed achievement, called Valve Gift Grab 2011 - L4D2, was added to the PC version of Left 4 Dead 2 for a limited time in late December 2011.

As a reward for 60,000 players earning the Connecting Fights achievement, Valve released a beta version of the Blood Harvest campaign for Left 4 Dead 2.

The Cold Stream update added 2 new achievements to Left 4 Dead 2 called Stream Crosser and Connecting Fights, although the latter achievement is actually keyed to the conversion of the Dead Air campaign in Left 4 Dead 2.

The Sacrifice adds 5 new achievements to both Left 4 Dead and Left 4 Dead 2, and for the Xbox 360 and PC as well as Mac.

The Passing adds 10 new achievements to Left 4 Dead 2.

Crash Course adds 10 new achievements to Left 4 Dead.

Survival Pack adds 7 new achievements to Left 4 Dead for the PC version only.

There are currently 101 achievements for the PC version of Left 4 Dead 2 (one of which, Valve Gift Grab 2011, can only be obtained in December) and 65 achievements for the Xbox 360 version. There are 73 achievements in all for the PC version of Left 4 Dead, but only 65 for the Xbox 360 version the Outbreak achievement is not in the Xbox 360 version of the game and Survival Pack on Xbox 360 adds no new achievements due to technically being only a patch, not a DLC. Left 4 Dead includes achievements for Steamworks and Xbox Live.

Half life hidden achievement