Here is the full list of all 11 Suspicious Shuffle achievements.
Complete the first Act
Nab a skin!
Nab an accessory!
That's thinking with your noggin' - Finish 'Puzzling'
10s across the board! - Finish 'Proper Form'
That's using the ol' peepers - Finish 'Observation'
Just the right amount - Finish 'Kickin It Up a Notch'
New mechanics?! - Finish 'Seeing Red'
Complete the second Act
Now that's Shuffling - Earn 3 stars on every level in Act 1
Oh my, now we're REALLY Shuffling - Earn 3 stars on every level in Act 2