Very easy to do, just need some patience and knowledge on where to look.
This is not an achievement, this is a feat of strength.
What you need to do:Simply look for fire, wind, water, and earth elements. Kill enough till you get a 60 minute buff. The buff is element specific (earth/wind/water/fire powered). You do NOT need to be in any level range for the buff.
Bonus daily quest:If you do happen to come across elementals in your level range, kill until you get the buff. Once you have the buff, the elementals will disappear and a crystal will appear where the spawn rift once was. Go up to it and right-click. Accept the quest and turn it in for free exp/gold. This will count as a daily quest. If you are not in level range, you will not get the crystal, instead, an hourglass will takes its spot. You can't do anything with the hour glass.
The elementals appear once every hour, so if you miss them, go do something for the next 60 minutes.

Tripping the Rifts

Tripping the Rifts

Tripping the Rifts

Tripping the Rifts

Tripping the Rifts