Korgan

100 GS achievement for killing the second boss

~Kill the Leviathan Boss~

Pretty easy to kill with the mage. He has two stages. Deal with the other enemies asap, they will stay dead even if you die. You can see me fight him in my video @12:10

I go over how to kill the dark knights @ 9:10

This is my achievement walkthrough which is a run through of the game and achievements.
I show and tell you how to do everything needed for the full 1000 completion. You can get the full completion in the prologue which is free. More achievements will be added in the future via paid DLC.

*Update from comments* wosmack has mentioned this unlocked for them randomly in the 3rd level playing the game the next day, so it may just be some odd Xbox Live delay.

For those that don't get this to unlock on your first run, I would advise you to delete your save data before running the game again to get this to unlock.

I ran a new game after completing the prologue, thinking I could get it quickly from another Leviathan kill and it didn't pop.

Following FTV Leviathan's post in the TA forum, I cleared my save data from everywhere and ran the game again, it unlocked this time after killing the 2nd boss.

Hope that helps for anyone not getting it to pop.

*Additional edit regarding deleting saves as mentioned in comments*

If you’re unsure on how to delete your save from console and the cloud, when you’re in the Manage Game section, make sure to select the save file itself and don’t use the Delete All button. By selecting the save file, it’ll then give you the option to delete from just your console or everywhere.