Sable

This achievement is available to unlock as soon as you can enter the area surronding Eccria. I would suggest going for it when you are leaving for Eccria through the story. If you head in an almost straight westerly direction from Burnt Oak Station you should find the Balfron Connection. The entrance to the ship interior is on the left side of the ship facing the front.

• After climbing the grating into the ship you are in a smaller area. There are secrets and scrap in the ship but this is not needed for the achievement.

• Press on until you reach a large area with walkways along the walls on several sides. In this room there are two power stations and batteries.

• The first battery can be found next to the first power station. Just start this one up. When you reach the top there is a button to push. This brings a platform over to you. Use this platform and make your way along the walls all the way up until you find the second battery. Reaching this can be a bit tough so aim your jumps.

• When you have the second battery jump down and use the first power station springboard to jump up again. When you land pick up the battery and go into the corridor where you have not been. Following this should lead you to a second power station. Use the battery and the achievement should unlock!

Video for those that like those better.