Nex Machina

Secret levels are unlocked by destroying arcade machines in regular levels. Most of them are hidden, but they are still rather easy to find. Your first opportunity of getting this trophy is in world 1-3. Destroy the blocks in the top right corner and you’ll see the arcade machine. Simply shoot at the machine and you’ll get a notification saying “secret level unlocked”. Now finish off the remaining enemies and you’ll automatically enter the secret level, thus unlocking the trophy.