Go To The Store Page And Get The Free Dead Lands DLC
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Then Start A New File On Dead Lands.
On Each Island There Will Be A Guy Hanging In A Cage, And You Can Spend 10 Coins On Them.
This Marks Their Cage Rope To Be Shot By One Of Your Archers.
After They're On The Ground, Pay 3 Coins To "Recruit" Them.
This Will Change Your Character To The One That Was In The Cage.
Once You Get Up To Stone Wall Technology, A Stained Glass Archway Will Appear Within Your Walls.
Paying 5 Gold Here, Will Change Your Character To Whatever Character Is On Said Glass Pane.
Progress Until You Get To Island 4, Buying All The Caged Guys You See.
As You Release Your Third Guy In a Cage On This Island, The Achievement Pops.
Goodluck!