The following achievements require the July 2009 update.

Achievement	How to unlock
Drain Cleaner ( 30 points )	Kill 20 enemy squads with a continuous Covenant Leader Power on Memorial Basin.
Killjoy ( 25 points )	Disrupt 5 active Leader Powers in a single game on Blood River.
Never Leave a Man Behind ( 15 points )	Finish with 5000 net resources tributed to your teammates on Memorial Basin except in Deathmatch.
Tour Coming Through ( 30 points )	Hot drop 50 squads to your Covenant Leader in a single game on Barrens.