Developer menu (Unlock All)
Add to the 2012 PC version's launch options: right-click Alan Wake > Properties > Launch Options. An in-game debug menu opens with level skip, weapon giving, light/ammo and health toggles. Does NOT work in Alan Wake Remastered.
-developermenu (Steam launch option)
In Steam: right-click Alan Wake > Properties > Launch Options, add: -developermenu. Launch; the developer menu opens in-game (function keys toggle its options). Works on the original 2012 PC version — NOT Alan Wake Remastered.