There is currently no guide for this achievement.
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
| Game: | Portal 2 |
|---|---|
| Service: | |
| Rarity: | 5.70% (Very Rare) |
| Tags: | (None) |
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
| Game: | Portal 2 |
|---|---|
| Service: | |
| Rarity: | 5.70% (Very Rare) |
| Tags: | (None) |
There is currently no guide for this achievement.
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