Hidden Rockstar Social Club Achievements

[Biggs]

If anyone was like me and wondering what the hidden achievements listed on Rockstar Social Club are, they appear to be the same as Xbox.

The ones in question are located between

'Bike or Biker' and 'Liberty State of Mind'
'Horror of Santa Maria' and 'Smooth Moves' [/strike]

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Who Needs Directions?
Find Mike Toreno without any of the referenced locations during "Mike Toreno".

They Can’t Stop All of Us
Sneak into the underground base without setting off the alarm above ground during "Black Project".