Clients who climb into the Atlas will have game crippling bugs as the SP Atlas actions are not synced to clients, leading them to typically warp to miles away. Use this only in private matches with people who understand what's going on.

If you blast open the Atlas as an assassination target you will have to get into the atlas and have it die to complete the kill. Additionally if you open two atlases the wave can't end as the Atlas object is still considered the enemy. Open the console and type in skipwave to end the current wave.