There are some short codes for a few, but not others, so here are the long codes for all 6: You will need to spawn 6 artifacts to access the Guardians.
If it's too fast for aiming or such, you can drop it down to 5 or 4. Slomo 7 - This speeds up the whole world. Now, back out, and go to The Center from the menu. When you start again, you'll have to respawn. I actually don't know if you need all three for The Center, but you do for those achievements. Note that you will likely lose stuff when you do this. This will also give you 3 achievements on their own. If you haven't Ascended yet, you need to go to the Island. If you can connect to your Windows 10 PC, you can use this to speed up the console commands significantly. Go to the Pause menu, then simultaneously press LB+RB+X+Y. As usual, you need to use the codes to unlock them. You can do this super quickly using console commands. Here is the quick and dirty guide for how to do this.
