Covenant "Hot Drop" is an Achievement in Halo Wars that is unlocked when the player kills 5 Covenant units by deactivating the bridge on Relic Interior.
It is worth 5 Gamerpoints.
Once you rescue Forge and Anders, cross the bridge to the east. After all your units have crossed the bridge, wait until the Covenant Units are crossing the bridge.
Then use the console below the bridge to deactivate it. Repeat until you have made 5 covenant units fall to their death.