I need someone who has the checkpoint on Halo 3 ODST and can help me to get the achievement please.

GT: LnT Apocalipo
Hey OP,

I don't have the checkpoint but I'm not sure the checkpoint option works anymore. I had a friend start the game with the checkpoint and I didn't get the achievement. You might have to start from the beginning to get the LASO achievement.
That's strange maybe you should try again with your friend or you should host
They patched checkpoint-sharing, you can't do it anymore. About time, too. Better go earn your LASO!