Dungeons 4

Tanos will move around to each camp and attack it (even though they are the same faction) - in order to prevent this you will need to pay attention to your map and look for the glowing eye icon, this is where he's heading and if you're fast enough you can destroy it before he gets there.

Eventually deliveries and repair wagons will appear which he will also attack, again rinse and repeat.

But the most important part is when he goes to attack the "Good creatures" (Unicorn etc.) - you can let them fight each other and then intercept when the boss is low, snag the kill and get free evilness/prevent him from getting it.

highly recommend leveling dungeon to 6 for Gorgu summon as this WILL kill Tanos and take him out of action for 2 - 3 minutes.

I try to come up with simple solutions to achievements in this game - because there is a LOT to keep up with when you are under pressure. For this achievement - there is only ONE critical thing to do, and you'll easily finish it up.

Once you start - gather evil and gold to reach Level 6 dungeon research (and get Thalya to level 6). Once she has reached level 6, simple go to the overworld and kill Tanos with Gorgu. You can ONLY kill him with Gorgu.

Now, the Tanos respawn timer is LONGER than the timer to resummon Gorgu. Simply pay attention to the timer on Tanos, go to the overworld, and re-kill him again with Gorgu. It stops his ability to gain evil at that point.

In my game, Tanos reached about 800 evil when I killed him the first time. He finished with 900 evil total after a 40-50min game. It is also easier to play the game on easy