Halo 3 achievements

Halo 3

4.2 from 24615 votes

There are 79 Halo 3 achievements (49 without DLC) worth 2,662 (1,750)

303,915 tracked gamers have this game, 19,855 have completed it (6.53%)

Achievement Details

The Key in Halo 3

The Key47 (40)

Finish the eighth mission of the Campaign on Normal, Heroic, or Legendary.

  • Unlocked by 221,115 tracked gamers (73% - TA Ratio = 1.17) 304,147  

Achievement Guide for The Key

252,860 (150,924)
Achievement won on 26 Mar 09
TA Score for this game: 1,659
Posted on 01 June 09 at 16:53, Edited on 01 June 09 at 16:54
This solution has 41 positive votes and 0 negative votes. Please log in to vote.
Alright for all of you playing on Legendary here it is.

I just finished Cortana on Legendary singleplayer. The easiest way to do this is to use the numerous cloaking devises laying around and needlers/energy swords to fly through the level. I just complete the level in 45 min. It was actually I think a really short level...

Main thing, is keep on the move, if you stop, your done for. The best weapon for those Flood Snipers, what ever you want to call them, is the needler.

Just remember like any level, when playing on Legendary, don't try killing everything, just try to do what you can to make it from checkpoint to checkpoint!
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