SMITE

As Cabrakan keep an enemy stuck in a single Tremor for six seconds.

Cabrakan's 3rd ability – Tremors – is an AOE spell that deals damage and trembles enemies all around him. It can be cast for a maximum of 10s, drains mana for each half second using it, and can be cancelled at any time during the cast.

This achievement shouldn't be too hard, but you should work on the following:
– You'll need to build mana items such as Breastplate of Valor, in order to sustain the mana drain
– You should build the Curse relic in order to slow enemies before casting the spell
– You should NOT level up your 3rd ability, for it will increase the mana cost

TangoDown456 says: you should build Gem of Isolation as well, which gives a slow on enemies upon taking ability damage, which might help them stay in the tremors a second longer.

This achievement can be earned in any game mode; Arena can be a good place to go, especially when you are to escort the Juggernaut minion to the enemy Portal: you'll most likely be 1v5, enemies won't necessarily try to kill you first and won't move around too much because they will try to damage the Juggernaut as a priority.
Otherwise, any map with walls and small paths (especially in the jungle) will do the trick.

→ In game you should try to trap the target enemy in between terrain walls and your ultimate walls so that the only way they can go is forward, thus leaving enough time to tremor for the 6 seconds required. Before activating your 3rd ability, use your Curse relic and stun the target with your 1st ability.

This achievement should be earned much easier with friends that can land crowd controls on the enemy, and that will give you the time needed to the achievement.