Complete all test chambers in the Excursion Funnels co-op course - Portal 2
Perform all 8 gestures of your own volition in co-op - Portal 2
Complete all test chambers in the Hard-Light Surfaces co-op course - Portal 2
170/357130/2008/12
447/1,485390/1,00021/37
377/1,519335/1,00022/50