Bot Buddy Achievement in Doom 3: BFG Edition
Keep a Sentry Bot alive to its destination in DOOM 3, RoE, or Lost Mission (except Mars City)
How to unlock Bot Buddy
This is very simple to do with the first combat engaged Sentry Bot that you find, which is located at EnPro Entrance. Just make a save before you proceed and if it dies, load and try again. It should be noted that they CAN be destroyed; they can just take a lot of damage. Try and protect it the same way it protects you. It’s a team effort you know.