Roadmap

Stage 1: Get to Round 3

Welcome to this free DLC for Switchback VR! Make sure to download this add-on on PSN on order to access this content. Start by playing the Horde mode and reach Round 3, which takes roughly 30 minutes. Each round contains four different rooms of enemies you'll have to defeat. Some enemies appear in multiple rooms, while others are only in one. Once you complete a round, you will have to defeat an increased number of enemies in each room to move on, so getting to 500 in a run will happen in round 2. When you see mannequins, the best tip is to try to tactically blink in room 4 to control when they appear so you don't get overwhelmed.
Reach round 3 of Haunted Shipwreck horde mode
Kill 500 enemies during a single Haunted Shipwreck horde mode session
Get the Soul Gun during Haunted Shipwreck horde mode

Stage 2: The Grind

Focus on getting as many headshots as possible to get through rooms/rounds as fast as possible. That also allows you a chance to collect the Soul Gun between rooms. The Soul Gun has limited ammo, but also one-shots all enemies no matter where you shoot them. Regardless of skill level, this will take you multiple hours to complete. Just getting to round 3 takes roughly 30 minutes and has 682 total enemies, and individual rooms will only take longer as you get through more rounds, but that's because they have more enemies, with over 100 in rooms beginning in round 3. To prevent this from becoming a long grind, either continue and work on improving your high score or maybe find a balance of enemies and time that fits for you until you pop enough heads and clear the 5,000 enemies.
Kill 5000 enemies in Haunted Shipwreck horde mode
Explode 2500 heads in Haunted Shipwreck horde mode
Kill 250 enemies with the Soul Gun in Haunted Shipwreck horde mode
Such a Horde
Reach round 3 of Haunted Shipwreck horde mode
9.32%
Very Rare
Gold
You will unlock this trophy after making it to the third round of Haunted Shipwreck. Be sure to be both precise and consistent in killing enemies to prevent an early death. When you see a weapon box, make sure to shoot at it to upgrade your starter pistol as it comes fairly often. Take out the two-headed enemies in room 2 before they get too close to you. They hit hard and can kill you relatively quickly if you're not careful. Also manage your blinks in the "Do Not Blink" room 4 with the mannequins to prevent getting overwhelmed. While not particularly hard, reaching round 3 will take approximately 30 minutes of play. If you don't get it sooner, then you'll unlock Silver Horde Master along the way.

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Such a Horde Video Guide

Credit to NewKnightmare for the video.
Extinction Event
Kill 5000 enemies in Haunted Shipwreck horde mode
7.47%
Very Rare
Bronze
This trophy is likely to be the one that takes you the longest to get in the DLC. It can be grindy unless you're able to get through a good chunk of rounds per session. For example, the first two rounds consist of just 682 enemies. Starting in round 3, rooms will begin to have over 100 enemies, so it'll slowly get better if you have the skills and patience. Otherwise just keep playing at your own pace and you'll likely get to 5,000 within a few hours.
Surgical Precision
Explode 2500 heads in Haunted Shipwreck horde mode
7.47%
Very Rare
Silver
You need to explode 2500 heads to unlock this trophy. Aim for headshots, which will be the quickest way to kill enemies. The Soul Gun and Revolver are most efficient as they both are one-shot kills to the head. There are an endless amount of rounds if you can survive; otherwise, just keep focusing on aiming for the head, and you'll likely pop the trophy within a couple of hours.
Horde Master
Kill 500 enemies during a single Haunted Shipwreck horde mode session
10.39%
Rare
Silver
You may get this trophy while attempting to get Gold Such a Horde. The 500th enemy will be the 10th one you kill in the third room of round 2. It'll take around 20-25 minutes to unlock the trophy depending on how fast you get through the rooms. Don't worry if you don't get on your first attempt or even your first couple of attempts as you learn to deal with the different enemies.
Now I Have a Soul Gun. Ho ho ho
Get the Soul Gun during Haunted Shipwreck horde mode
25.24%
Uncommon
Bronze
This is the quickest and easiest trophy to get in the DLC. The Soul Gun can be acquired if you achieve eight headshots in a row in a room. Just make sure to shoot the glowing purple box on your way to the next room to obtain the Soul Gun. The gun is in a fixed location after each room. It will always be on your right after the first room and on the left after the other three. If you do not get the headshots, the location where the box would be will instead contain skulls with purple glows.

Soul Stealer
Kill 250 enemies with the Soul Gun in Haunted Shipwreck horde mode
7.96%
Very Rare
Bronze
Pleas refer to Bronze Now I Have a Soul Gun. Ho ho ho for how to acquire the Soul Gun. The Soul Gun will one shot every enemy regardless of what part of their body you shoot, so getting 250 kills is only a small grind.