For completionists, Observer offers a range of achievements that encourage thorough exploration and engagement with all aspects of the game. Many achievements are tied to completing the main story, but several require specific actions or finding all collectibles. Here's a brief guide to some common achievement types:

- Story Achievements: These unlock automatically as you progress through the main narrative. You can't miss them.
- Collectible Achievements: These often require finding all instances of a specific collectible, such as all 'With Fire and Sword: Spiders' arcade cabinets, or all collectible documents. To get these, you'll need to meticulously search every room and use your vision modes frequently.
- Dialogue Achievements: Some achievements are tied to specific dialogue choices or interacting with all available residents via intercoms. exhaust all dialogue options when speaking to NPCs.
- Secret Achievements: A few achievements might be hidden, requiring obscure actions or discovering specific easter eggs. For example, interacting with a particular object multiple times or finding a very well-hidden area.
To maximize your chances of unlocking all achievements, consider a second playthrough after completing the game once. This allows you to focus purely on exploration and specific actions without the pressure of the main narrative. Always check your achievement list in-game or on your platform's client to track your progress and identify what you still need to accomplish. A dedicated 'all collectibles' guide might be necessary for 100% completion.