The checklist: reach the final checkpoint (Level 6.2), clear the restricted-tower achievements, deal 666k damage with one Nuke, and buy every upgrade for Fully Loaded. Those are the only conditions the official achievement list defines.
The three components of a full clear
- Campaign progression. Steam achievements confirm checkpoints through Level 6.2. Surviving 6.2 (Against All Odds) is the furthest published progression marker, and the 6.2 route is documented on this site.
- All 11 achievements. The restrictions are official: single-tower and no-tower clears, one/three/four tower-type runs on specific levels, the Elemental Carnage trio and the 666k Nuke. Open routes for each live in the achievement tracker.
- Fully Loaded. The achievement text requires buying every upgrade. That makes resource farming after the final level part of a true 100% run, not an optional extra.
What is deliberately not claimed
There is no official "100%" counter, no published total playtime for a full completion, and no official list of every level beyond the achievement checkpoints. The 4–6 hour official estimate describes the campaign target, not a completionist run. This page does not invent a completion hour figure.
Watch full completion runs
Several creators have recorded finishing the game at 100%. These are third-party videos — useful for pacing and order-of-operations, not authoritative on mechanics. Each player loads the YouTube embed only after clicking.
Ordering the run efficiently
The community evidence supports a few sequencing principles; none of them are official rules:
- Do restricted runs when the level is fresh. Specialist on 3.1 and Triple Threat on 5.1 are tied to the same maps the campaign asks you to survive anyway; the achievement routes on this site show legal rosters for each.
- Leave Overkill for a prepared crowd. The 666k condition is about one Nuke hitting a packed group — the crowd-control setups in the Overkill guide are what the community reports working.
- Fully Loaded comes last. Buying the whole tree is cheaper to finish once you know which branches the late levels and achievements actually required.