Start with a slide down from about the 8th fret on the a string, to 3rd fret

Riff A

G----------------------------------------------
D--2-5-2-2-5-2-6-9-6-9-6-----------------3232--
A-3-----3-----7---------7-5-4-7-4-5-3-2-3----32
E--------------------------5-----3-----1-------

riff B

G|------------------9-7-5-4----------------
D|-2-5-2-2-5-2-6-9-6-----------------------
A|3-----3-----7----------------------------
E|-------------------------5-53-3111-444433

Riff C (Bridge 1st part)

G|------------------------------------------------- 
D|-------------------------------------------------
A|-----------------3-3-3-------------333333-3------
E|-----0-0--0h1-1-1------2-2-1-1-4-3-------3-3----- 

Riff D (bridge 2nd part)

G|------------------------------------------- 
D|------------------------------------------- 
A|-----------------3-3-3---------------------
E|-----0-0--0h1-1-1------2-2-1-1-1-1-1-3-----

Riff E (breakdown/interlude) change speed as it progresses

G|----------------------------------------------------------| 
D|----------------------------------------------------------| 
A|----------------------------------------------------------| 
E|---5-5-5-5-4-4-4-4-3-3-3-3-2-2-2-2-1-1-1-1-1-1-1--3-3-----| 

good bass line, listen to it to get the order of each riff