For the Gamerscore just load the save.<br />
To get the 108% on leaderboard start a new game, go left and collect the egg. Now, end the game and watch on the leaderboards.
Limbo [200G & 110% Leaderboard] 04/06/2016
Limbo [200G & 110% Leaderboard]
Limbo [200G & 110% Leaderboard]