Achievement Name - LEGO build-master
This achievement requires you to build 100 different build-its throughout your playthrough. This should come naturally, but if somehow it doesn't, there are some build-its in the Mos Eisley Cantina that can be repeatedly built every time you exit a level or start up the game. You can rebuild the same build-its (which is helpful if you want to unlock this achievement early in your playthrough).
A 100% video guide can be found here: https://youtube.com/playlist?list=PLs9rvQZdz2r65Tz_wPJUwbV7W...
(Credit to HappyThumbsGaming)