Army of Ruin
221 Achievements
GOG
Ice Tear
Glacier I - Upgrade Toxic Stench to Level 5
28.9%
How to unlock the Ice Tear achievement in Army of Ruin - Definitive Guide
You'll need to first complete Forge I and unlock Toxic Stench (10G). Then, play this stage, hope to get Toxic Stench as an option, then max it out.