Quick answer
Eliminate multiple Covenant enemies in quick succession using the new weapon without dying during the 'New Whip' mission.
Guide briefing
Halo Campaign Evolved New Whip Achievement Guide
Eliminate multiple Covenant enemies in quick succession using the new weapon without dying during the 'New Whip' mission.
Applies to
- — Halo Campaign Evolved
- — New Whip achievement
- — First mission of the campaign
- — Player must use the new weapon to kill enemies

Target
Eliminate Covenant enemies while using the new weapon (implied: need to fire and kill)
- Checkpoint
- First enemy engagement
- Landmark
- Initial combat zone
Do this
- 1Respond to 'WE'VE GOT COMPANY.' by engaging nearby Covenant forces.
- 2Fire at approaching Covenant units as indicated by 'Firing!'
Confirmation
Eliminate Covenant enemies while using the new weapon (implied: need to fire and kill) is available as described. The achievement likely requires killing multiple Covenant enemies in quick succession without dying. The phrase 'We cooked them good' suggests successful elimination of a group.

Target
Eliminate Covenant enemies while using the new weapon (implied: need to fire and kill)
- Checkpoint
- Second enemy engagement
- Landmark
- Mid-combat zone
Do this
- 1After taking cover, re-emerge and engage remaining Covenant forces.
- 2Confirm elimination with 'Got him!' and 'Hostile eliminated.'
Confirmation
Eliminate Covenant enemies while using the new weapon (implied: need to fire and kill) is available as described. The achievement may require two or more kills in rapid succession. The repeated 'cockroaches' line indicates persistent enemy presence.

Target
Eliminate Covenant enemies while using the new weapon (implied: need to fire and kill)
- Checkpoint
- Final engagement phase
- Landmark
- Combat conclusion area
Do this
- 1Continue engaging new waves of Covenant as warned by 'MORE COVENANT SIGHTED.'
- 2Secure the area with 'GOT YOU COVERED.' and confirm final threat clearance.
Confirmation
Eliminate Covenant enemies while using the new weapon (implied: need to fire and kill) is available as described. The achievement likely concludes when the player successfully eliminates multiple Covenant in sequence across multiple engagements.