Halo: Campaign Evolved Arm's Length Achievement — How to Unlock

ACHIEVEMENT ROUTE

Halo: Campaign Evolved Arm's Length achievement requirement: On 343 Guilty Spark complete the first floor without taking a hit

Route preparation

1. Learn where the first-floor segment begins and ends before attempting the no-hit condition.
2. Prioritize distance, corners and escape space over maximum kill speed.
3. Restart immediately after confirmed damage rather than carrying a failed attempt deeper into the mission.

Failure conditions

Take any hit during the first-floor section and the attempt is over.

Related guides

• 343 Guilty Spark mission guide
• All achievements
• All 42 skull modifiers