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Long Jump

Jump 300 feet.

Long Jump0
6 guidesOffline Game ModeSingle Player
SabrenautSabrenaut62,545
19 Aug 2011
11 0 0
To unlock this one, just find any hallway or dead end that is roughly 2x2. Place one portal on the upper wall tile and the other portal on the floor tile adjacent to the opposite wall. Step through the floor portal and the wall portal will throw you against the opposite wall, and you will fall down through the floor portal, starting the process all over again. The achievement should unlock within a minute. (If you are getting "stuck" on the floor, just make sure your floor portal is aligned right up against that opposite wall.)

The 2x2 space I found is in Chamber 16 (Chapter 8), through the doorway and directly to your right after you defeat the second turret.