In order to complete the achievement "Globetrotter", you need to visit all 21 locations at least once on the same day and defeat the monster there.
The 12 locations are as follows:
- Black Water Swamp
- Busted Lands
- Gnarogrim
- Maerwynn
- Magmaron
- Moldy Forest
- Plains of Oz'Korr
- Rotten Lands
- Shadowrock Mountain
- Skull Island
- Sprawling Jungle
- Sunburn Desert