This is a quick and fast guide for the DLC missions!

There are 30 total Percy missions you have to do. If you do not feel like completing them all to completion you can do a lil work around!
If you noticed or not, if you fix all parts, or just do the configuration and finish mission, it counts as completed and will generate the next missions for you.

I FULLY did about 14 of them before I went to try this trick, but should work for however far into the DLC you are.

HERE IS THE GUIDE!
1. Pick a mission
2. Crane the rover to the lift
3. Plug in the little USB configuration item without even doing anything to the rover
4. Go configure the rover (having the auto complete helps here)
5. Hand in the mission and move on.

Now once you do all 30 missions, you might not get a pop up. I restarted game, did it again, and I myself didn't get the achievement pop up. What you have to do is the 6th part to the mission

6. Fully complete 1 mission!

I did the first missions again, made sure i fully repaired everything and handed in the missions, once handed in I got the pop up for All Percy missions completed!

Hope this helps! <3