Load game, walk a few steps, listen to the sing-song and it should pop.
Requirements
DLC requirements
DLC name
Jaws of Hakkon
The Black Emporium
Spoils of the Avvar
Spoils of the Qunari
The Descent
Flames of the Inquisition Weapons Arsenal
Flames of the Inquisition Armor
Armored Mount
Deluxe Edition
Red Lyrium Reapers Weapons Pack
MP: Destruction
MP: Dragonslayer
Trespasser
Permissions and credits
Credits and distribution permission
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Upload permissionYou are not allowed to upload this file to other sites under any circumstances
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Conversion permissionYou are not allowed to convert this file to work on other games under any circumstances
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Asset use permission in mods/files that earn donation pointsYou are not allowed to earn Donation Points for your mods if they use my assets
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Stick in your saved game folder.
If you can't find it on load screen rename the bit before .DAS to a save file you dont mind deleting.
If you can't load it because it is a save made on a "newer version of game" go to your DAI directory > Update > Patch > Open package.mft in notepad and change version number. Mine was version 12.
Supposedly the achievement doesn't pop sometimes when you get to Skyhold and you have to fast-travel somewhere but mine popped without needing to travel.