Currently, the challenge map is not possible to plat legit so here is a way to cheat it so you can get your plat medal.
Plating Stronghold Siege Guide
- Goto Steam->steamapps->common->Iron Harvest->config.
- Then open "Units_01_Core" with Notepad.
- When its open, press CTRL and F together.
- Paste "pol_soldier_exo" into the search bar and then press enter.
- Below there is going to be lines of code that you should see.
<!--Polania Spec Ops-->
<UnitConfiguration id="pol_soldier_exo" type="exoskeleton" parentId="com_exo">
- What you want to do is change the value inside "<Health>175</Health>" to be "<Health>1750000</Health>" then save the file.
- Launch the game and challenge. Send out 1 exo to capture the VP inside the fortress and the other to capture the 2 VP's on the left side of the map.
- Once you got the plat medal then close the game and then verify the game files to undo modifications you did to the game files and you should have the vanilla files and the plat medal when your ingame.