Here is the full list of all 8 Suspicious Slide achievements.
Placed blocks, rocked socks (Cleared "Center Stage").
Now exposed as a slide professional (End of Act 1).
It makes the team work (End of Act 2).
The finale, far less sliding than expected (End of Sliding).
Achieved a gold medal on the level "Rampager"
Working together never felt so good (Cleared "Worlds Apart")
Outside deemed unsafe (Cleared "Introverted")
Achieved a gold medal on the level "Feeling Blue"