Posted on 19 January 25 at 05:36SammyGabryl has just submitted some Achievement Flag Info for Classic Marathon Achievements:You can view the flags they submitted here: Flag submission by SammyGabryl for Classic MarathonSammyGabryl said:Currently playing through the game with this guide: https://steamcommunity.com/sharedfiles/filedetails/?id=32451....Achievement flags are taken from the guide. Comments in the discussions indicate that achievements are disabled in co-op.