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Contaminant Cleaner
Defeat the Animated Contaminant during the Researchers Under Fire: Titan Lockdown event.
Contaminant Cleaner is a 10-point achievement earned by defeating the Animated Contaminant during the Researchers Under Fire: Titan Lockdown event before the titan response team arrival timer expires.
Form a Full Raid Group
This achievement requires a full raid group and cannot be soloed. Two stages require players to pick up large numbers of items from the ground and carry them to consoles — currently 50 parts and 60 stones — making completion with fewer players extremely difficult within the time limit.
Clear 8 Waves Before Timer Expires
The 9-minute timer begins immediately when the event starts, including during the initial Sundered Flame pack fights. All mobs in each wave must be fully dead before the timer ends — being in combat with any mob when the timer expires means that wave does not count toward the required 8 stages.
Defeat the Animated Contaminant
The Animated Contaminant spawns as the 8th stage objective while the timer is still active. Defeat it before the timer expires to earn the achievement. Completing all 12 stages also rewards the 
Indebted Researcher's Gift.
Tips
Run this event while it is current content, as full raid groups are far easier to find and the achievement becomes significantly harder to complete once the content is no longer current.