Achievement Hunter will let everyone know if you're trying to complete an achievement. All players currently in your lobby and new players joining will receive a chat message about your lobby agenda. This mod allows you to complete achievements with random players (no need to change your Steam name anymore). You need to host your own game when using this mod, because you need to be able to access "Edit game settings" menu.
Updated information can be found from LastBullet
Download (latest version)
Please, don't steal my code. You can use this for your own purposes, but credit me if you do.