Left 4 Dead 2 - Expert Lone Gunman (TAS - Full Game)
In this case, it would be TSA - TimeScale Assisted - which means everything in this video was played at a quarter of the normal speed (host_timescale 0.25) then played back at normal speed.
All 13 official campaigns (plus a custom one) completed without other cheats or mods (only visual mods - skins, textures, animations, etc.).
While I died at the end of GoldenEye 3, I technically completed the chapter, and I'm not gonna do it again just because the game decided to spawn zombies INSIDE me.
I'm not sure I could actually do this in normal speed, but I did complete about 40 chapters two years ago, so I'm pretty sure I could complete all but the hardest (The Passing finale, and maybe Swamp Fever finale since I suck at kiting two tanks) with some patience.
0:00 - No Mercy
17:00 - Crash Course
27:48 - Death Toll
46:08 - Dead Air
1:03:41 - Blood Harvest
1:17:56 - The Sacrifice
1:32:08 - Dead Center
1:43:15 - The Passing
1:55:24 - Dark Carnival
2:13:18 - Swamp Fever
2:33:16 - Hard Rain
2:49:04 - The Parish
3:01:22 - Cold Stream
3:09:24 - GoldenEye (bonus)