This probably has been posted before but maybe not in such detail.
I did these shortcuts for the longest time to get fast badges everyday.
Underbog 3 bosses 20min run - Clear to the first boss kill him, hug the wall east of the boss and run south to the edge, do a jump off the edge (wall jump) once and you'll land on an invisible path, walk across staying above the dark line (otherwise you'll fall when you get too far) once you come to that part that sticks out walk to the edge of it and wall jump 3 times then run across, from there run to the last boss kill him and then kill the 2nd to last boss, grats 3 easy badges in 20mins.
Blood furrence- this one is most commonly known but there are two ways to do it, first jump - Hug the right wall of the stairs as you run up it, into the corner and proceed to wall jump using this method ( jump once using spacebar then press forward ONCE, rinse and repeat till ur over it.) doing the first jump requries someone with a pet. Once the part is all there run up to the gate and spam click the pets ability while having the boss targeted until the pet attacks the boss and brings him back.
second jump- most commonly known is the room right after the staircase, just hug the right wall until you come to the northeast corner proceed to wall jump, this one can be done in many ways, either holding forward and spamming the jump button or the same way as described in the first jump.
Ramparts - As soon as you enter to the right is a wall you can wall jump it easily and kill the last boss and 2nd to last even the 1st if you clear 2 more packs and wait for him to pat to the doorway of the ramp. You can wall jump without clearing the first group of mobs but most groups will want to clear the first group unless your an expert wall jumper.
More to come.... getting tired so going to bed! hehe