This is probably the first achievement you will get and you can get it within 2-3 minutes of starting the prologue level.
In the first area, after destroying a load of storm troopers you will get some Lego bricks to build in the middle. Holding
to build you also now have to push and hold left
or right
on the left stick as you have a choice of where to build.
So for example, build the trampoline on the left, then walk up to it and smash it up. This will return it to a pile of bricks in the middle. Just then hold
to rebuild and the opposite direction to the first build you did. There you go, achievement unlocked!!