0:00 Dead Center
5:31 The Passing
7:39 Dark Carnival
14:29 Swamp Fever
14:48 Hard Rain
16:03 The Parish
17:30 The Sacrifice
17:36 No Mercy
20:51 Crash Course
20:58 Death Toll
21:17 Dead Air
25:57 Blood Harvest
26:15 The Last Stand
26:29 Cold Stream
27:01 End
(These are not all the skips and tricks in l4d2 btw some of these were before TLS)