Ratchet & Clank: Rift Apart

The Headhunter is a sniper that costs 40,000 bolts and becomes available later in the story. This trophy isn’t very difficult, but a painless and fast way to get 20 headshots is upon your return to Sargasso to defend Morts from an invasion. If you stay on the platform where you spawn in and snipe the large nefarious robots and the nefarious peacekeepers (the ships with 2 heads) across the way they won’t attack you. These enemies also have large heads, and are slow moving or stationary. When you run out of ammo either reload the checkpoint (seems to save progress despite the warning), or buy more from the Ms. Zurkon next to you.