Blades of Time

The keeper can be difficult if you don't know how to fight him: You can't damage him when his shields are up to lower them you need to do a variety of your special attacks I choose my power hit and fire or ice but I think any 2 or 3 different attacks will work. Once shields are down I just hit him til I got my power attack and used that to weaken and defeat him.

After this fight you fight him again on Earth which is a much simpler fight just take out all his support and avoid an area once it glows red then go attack him when all support is gone with Michelle and Zero. Again I used my power attack for this to go faster and the cycle repeats until he dies and then you get this achievement watch the end cutscene and it's game over.

Here are a few tips to take down the keeper quickly. Try dashing towards the keeper and when u r in range lock on to him with Left trigger then dash, this will allow u to get to him quickly and hit him a couple of time to charge your powers. You have to knock down his shields, and then do u'r ranged power punch ( press B then A) requires 1 red skull or power punch (hold B then press A) requires 2 red skulls. To knock down his shields quickly u have to hit him with your special ice (hit B then Y) or fire (hit B then X) attacks. Notice that his shield changes color, Blue for ice and Red for fire. U have to hit him with an opposite element to knock down his shields quickly. So if his shield is Blue, use your fire attack (B then X) to knock down his shield and the ice attack if his shield is red. Once shield is knocked down, & u have the red skulls, hit him with u'r sword or special range punch (B then A) or if u have 2 red skulls use the (hold B then A) attack. The keeper will try to punch at u, double jump over him when he tries this or dash out o f the way. He will also do a ground slam, try double jumping over him, land behind him and get some sword attack on his back side. He has a devastating long range fire ball attack when u r far away from him, so try to narrow the distance so he does not use this attack or else u r dead before u have any chance. Keep up the attack and don't let him get to far from u. Use u'r health when u r damaged. This is a lot of detail, but that's how I finally beat this chump boss. Best of luck.