There are achievements that you can get for completing certain tasks. However, if the sv_cheats code is enabled, the achievements are disabled. There is a way around this. There are a few command strings that can be bind to keys which allow you to enable or disable God mode when desired, get all equipment such as weapons, plus the better portal gun. To do this, use the bind "sv_cheats 1; wait; god; wait; wait; wait; sv_cheats 0" console command. For God mode use the bind' '"sv_cheats 1; wait; Impulse 101; wait; wait; wait; sv_cheats 0" console command.