Through the main soviet campaign on the second mission you’ll be tasked with guarding rally points before falling back. You’ll be given 3 shock troop squads through the mission.
The easiest way is to play on easy difficulty and just be mindful of their health. Keep these units behind your conscripts to ensure they’re not taking the brunt of the damage and remember to merge conscripts with them if their health is getting low.
When the mission finale comes you’ll have to draw your units back to the bridge. Move your shock troops first and foremost! The enemy will steamroll your units with tanks which can easily take out your shocks units quickly if your too slow to act!
Achievement should pop when the cinematic runs.