How To Play Offline Starcraft 2 ((install)) -

: You cannot earn achievements or gain profile experience while playing offline.

Choose the Play Offline option that appears. This will take you to a local version of your profile where you can access single-player content. What Can You Play Offline? how to play offline starcraft 2

Do not close the game. If you do, you will need to reconnect to the internet to relaunch it. : You cannot earn achievements or gain profile