LEGO STAR WARS: The Force Awakens

I played through the first 3 story chapters on Jakku in Free Play, collected all of the minikits in each level, but no achievement. I even played the Endor level from start to finish, no achievement.

But as soon as I finish Lor San Tekka's Return (also on Jakku) the achievement finally unlocked.

I'm thinking that this cannot be unlocked by any multi-stage level. What I mean by that is when you go to Free Play, if the level has more than one section that you can select, the achievement will not unlock.

Both Luke's Island (mentioned in NendoShisu's soultion) and Lor San Tekka's Return are single stage levels and all the minikits are in the same area, which is why I think it works on these levels but not in the story chapters where the minikits are spread out into different areas.

I could be wrong, but if the achievement is not unlocking for you try doing a single stage level.

I did assault on Jakku and followed this guide. It does require you to finish the game first and replay this chapter in free play