Stand by for Goatfall

Finish all wallrun quest 

To wall jump, press Shift to run, then jump at a wall while running forward.

To complete the achievement. you must wall run for 10 seconds. Your goat cannot do this all in one run, so you must achieve it by hopping from wall to wall. Find a place where two walls face each other at a 90-degree angle, such as on the Skyscraper. Use Wall jump onto one wall and wall run up, then jump to the other wall to continue upwards. Continue jumping between the two walls.

You may also be able to complete this as part of the Parkour Obstacle Course, or by not wall running at all due to a glitch. This achievement can only be completed on maps that have the quest Wall Run Hard active (GoatVille or Goat City Bay).

Sticking to a wall with Snail Goat or Dolph Spaghetti does not count as wall running.

Trivia

 * The achievement name, Stand by for Goatfall, is a reference to the game Titanfall.