A list of official releases. Details for are up, lyrics will be added soon.
This list is by no means mean to be exhaustive. If you're looking for more, try nincollector.com.

Halo 01 - Down In It
Halo 02 - Pretty Hate Machine
Halo 03 - Head Like a Hole
Halo 04 - Sin
Halo 05 - Broken
Halo 06 - Fixed
Halo 07 - March of the Pigs
Halo 08 - The Downward Spiral
Halo 09 - Closer to God
Halo 10 - Further Down The Spiral
Halo 11 - The Perfect Drug
Halo 12 - Closure
Halo 13 - The Day the World Went Away
Halo 14 - The Fragile
Halo 15 - We're in This Together Now
Halo 16 - Things Falling Apart
Halo 17 - And All That Could Have Been
Halo 18 - The Hand That Feeds
Halo 19 - With Teeth
Halo 20 - Only
Halo 21 - Every Day is Exactly the Same
Halo 22 - Beside You in Time
Halo 23 - Survivalism
Halo 24 - Year Zero
Halo 25 - Y34RZ3R0R3MIX3D
Halo 26 - Ghost I-IV
Halo 27 - The Slip