Brütal Legend

Pretty simple in practice - find a boar and ride it to the Sea of Black Tears. On your map near the Sea of BT, there should be a skull. If you still have a secondary task next to it, set that as your waypoint so you have a better idea where you're headed when you get close. You will need to have completed the game for this.

Now you need a boar. They usually run in a singular in the desert area, not too far from the entrance of Lionwhtye's Pleasure Dome. Look out for the burning tree trunks. Try to be fast when obtaining one, as they can group up and start bullying you pretty quick. Give one a quick electric zap from your guitar and hop on when they stop.

Boars are pretty wild to control since they constantly accelerate, but you can use the handbrake button to slow them down. Do this and pause your game if you need a moment to re-group.

Once you go into the mouth of the skull and get into the open cave, you'll see the ramp ahead of you. Be careful when you get close and try to time it right. If you jump off too early, the boar might get away from you. Too late, and you'll be swimming with the boar too. Jump off once you reach the apex of the ramp.

Once the boar drops, just wait a few seconds while the game confirm you are, in fact, not dead. The achievement will pop shortly after.