The pig-like enemies called "Blumuwats" are only found in the West Cliffs area. If you have to return there and do not have Telewarp, use the Toll-a-Warps to reach the pink area on your map located east of Looter Grotto and above Undermountain. There is no Toll-a-Warp that will take you directly to West Cliffs. Kill three Blumuwats to earn the Achievement.