SMITE

This is for stunning three enemies with Fenrir's first ability, Unchained, which is a jump. Remember, Fenrir's passive is his abilities gain additional benefits when his passive is stacked, so you're not going to stun anyone unless your passive is fully stacked. Your passive is stacked by landing basic attacks on enemies, minions or jungle creeps to fill up your runes. You need to land five basic attacks to stack it fully, and you can see how many more stacks you need on the bottom left.

Then, when you see three enemies grouped just jump in. In my case the enemy team had a Ra so they were all standing in his heal which was a nice setup. You can still use your third ability, Brutalize, to jump away afterward so you don't die. You can see me unlocking the award in the clip below:

Unleash the Beast- As Fenrir stun or kill at least three enemies with a single use of Unchained.
This is easiest done on Arena all you have to do is activate the ability Unchained which is a leap attack and hit or kill 3 enemy gods. You must have you passive charged in order to stun people. Once you see 3 or more enemies next to eachother just leap towards them and hit them with the leap damage.

Be careful however, since Fenrir is an assassin the enemy will be paying attention for you so try to sneak around if possible.