By YAZS Wiki · sources reviewed2026-09-02
Isolated City: official challenge milestones
The public Steam achievement list confirms three Endurance milestones for The Isolated City: survive 10 minutes, 20 minutes, and 30 minutes. It also lists a Hardcore completion and an Extermination objective that asks you to annihilate all enemies in this arena. These are useful, current-facing checks for deciding which mode to enter and what a run can progress.
- Endurance milestones
10, 20, and 30 minutes in The Isolated City
- Hardcore objective
Survive the Hardcore version of The Isolated City
- Extermination objective
Annihilate all enemies in The Isolated City
- Evidence
Public Steam achievement conditions, checked 2026-09-02
Pick a run goal before you enter
Use the official condition that matches your goal. A 10-minute Endurance run is a shorter check than the 20- and 30-minute milestones; Hardcore and Extermination are different mode objectives, not later steps in the same requirement. If you are following a mission or character unlock, read its exact in-game wording before treating one of these achievements as its prerequisite.
This matters for Boss Rush too. The Version 1.0 announcement says Boss Rush unlocks after Hardcore completion for each map, so an Isolated City Hardcore clear can be relevant to mode access. It does not turn a 10-minute Endurance achievement into a Boss Rush unlock.
What this official record does not establish
Steam's public achievement conditions do not publish The Isolated City's current unlock route, full enemy rotation, hazard timing, boss behavior, or a best squad. This page does not infer those details from an older guide. Check the current map-selection and mode screens for information that can change a run.
Use the Beginner Guide for a first-run process, the Boss Rush Guide for the separate Boss Rush requirement, and the achievement tracker when you want to keep a local checklist. Add a versioned in-game observation before promoting any specific enemy, hazard, or build claim to this page.
Related pages
Continue with the useful next step
These pages cover the prerequisite, system, or next choice most closely connected to this topic.
Guides
Beginner Guide
Learn automatic combat, movement, upgrades, squad choices, Camp progression and a repeatable first-run loop.
Guides
Boss Rush Guide
An official-source guide to unlock requirements, the ten-minute preparation window, arena finales and run review.
Tools
Database Quick Finder
Live client-side search across structured names, aliases and categories.