Halo: The Master Chief Collection - Halo 2 - 10 Minutes Too Early - Halo 2: In The Oracle, find the holo-drone before the Heretic Leader activates it. This achievement is fairly easy to unlock.
On the mission The Oracle (Have the sputnik skull on), right near the start of the mission in the first open room head to the right.
Jump on to a pillar where you will need to do a grenade jump.
Launch yourself up into the area where the holo-drone is waiting and your achievement should pop! Enjoy!