As I have been playing a lot of the LEGO Star Wars 2 game lately on Xbox I checked out my other Lego games and progress in the games. I noticed that in Lego Batman I had one achievement, that I had not got. No worries, pop the game in the console, and maybe after 1 hour of gaming got the last achievement and the 100% completion. Woo hoo! :)
Amazing to see that previous achievement was obtained almost exactly 5 years ago.