MOUSE: P.I. For Hire 100% Achievement Guide

If you’re going for full completion in MOUSE: P.I. For Hire, the game isn’t actually that hard—but it is very easy to miss things. This isn’t a game where achievements come naturally just by finishing the story. You need to stay alert the entire time, because a lot of collectibles and achievements are tied to small, missable moments.

GOUD’EM!

This is an early combat-based achievement that tests how well you control enemy positioning.

You need to eliminate multiple enemies very quickly in a tight sequence using the Mincer weapon. The key here is not just shooting fast, but grouping enemies together first. The guide suggests “kiting” enemies—basically letting them chase you—so you can line them up in a straight path.

Once they are grouped:

  • Fire through them so bullets hit multiple targets
  • Immediately move to the next group and repeat

The reason people fail this is because they panic and kill enemies one-by-one. This achievement only works if you treat enemies like a group, not individuals.

If you miss it, reload before the encounter—it’s designed to be retried.

HOLE-Y TRINITY

This one revolves around environmental kills using explosive barrels.

Instead of shooting enemies directly, you:

  • Pick up or position a barrel
  • Wait until enemies gather close together
  • Trigger the explosion to hit at least three at once

The trick is patience. If you explode the barrel too early, you’ll only hit one or two enemies. Let them cluster first.

This achievement is basically teaching you:
barrels are not decoration—they are weapons.

FIRESTARTER

This is a cumulative achievement, not a one-time event.

You unlock it by:

  • Killing multiple enemies across the game using explosive barrels

You don’t need to force it in one spot. Just:

  • Keep using barrels whenever you see them
  • Shoot or throw them into groups

If you’ve been playing normally but ignoring barrels, you’ll miss this. If you actively use them, you’ll unlock it naturally mid-game.

M-M-MUENSTER KILL!

This one is about multi-kill speed and chaos.

You need to:

  • Kill a large number of enemies in a short time window

Best way:

  • Use tight areas with many enemies
  • Combine weapons + explosions
  • Let enemies group before attacking

It often triggers naturally in big fight arenas if you’re aggressive enough. If you’re playing too safely, you might not get it.

BOOM TOWN

Another explosive-based achievement, but more focused on chain reactions.

You want:

  • One explosion to trigger multiple kills rapidly

Best approach:

  • Wait for enemies to group
  • Use a barrel at the perfect moment

Think of this as a “clean explosion” achievement—timing matters more than quantity.

THIS IS MY BOOMSTICK!

This is tied to weapon progression, not combat skill.

You unlock it by:

  • Collecting enough weapon schematics
  • Fully upgrading a weapon (like the boomstick)

Schematics are hidden all over the game:

  • In safes
  • Behind secret areas
  • In side rooms

If you miss schematics, you delay this achievement. If you explore properly, you’ll hit it naturally when upgrades become available.

SHOW SOME CULTURE, JACK

This is a story + interaction achievement.

You need to:

  • Take a specific photo (burning theatre scene)
  • Then return to the P.I. Office
  • Speak to the correct NPC about it

The important part here is:
not all achievements trigger immediately.

Some require:

  • Doing an action
  • Then reporting or interacting later

If you don’t revisit the office or talk to characters, you can miss these.

POCKET ACES

This is tied to the baseball card mini-game.

You must:

  • Play the card game
  • Win at least once

It’s simple, but easy to ignore if you skip side content.

This achievement exists to push you into interacting with optional systems.

STARTER DECK

This one is about collecting baseball cards.

You unlock it by:

  • Owning a certain number of cards

You can:

  • Find them in levels
  • Buy them in shops

It doesn’t matter how you get them—just reach the threshold.

BABE GOT BAT

Another baseball card milestone.

You need:

  • More cards than the previous achievement

This is basically progression-based—keep collecting and it unlocks.

COVER TO COVER

This is tied to collecting all Mouseberg Herald newspapers.

They are scattered across levels and sometimes sold by NPCs.

Important detail:

  • Some are missable if you don’t explore or don’t have enough money

To get this:

  • Check every area
  • Buy papers when available

EXTREMELY GRAPHIC NOVEL

This is the comic collection achievement.

You unlock it by:

  • Collecting all comic books

These are often:

  • Hidden
  • Off-path
  • Inside secret areas

If you miss even one, you won’t get this.

PAPER PERSON

This is a smaller interaction achievement.

You get it by:

  • Buying or interacting with a newspaper vendor

It’s simple, but only triggers if you actually engage with the NPC.

SPIKE-D 16 TONS

This is another environmental kill achievement, but focused on heavy objects (like props or pianos).

You need to:

  • Drop or use large objects to crush enemies

Best place:

  • Stage/set areas with hanging props

Timing matters—wait for enemies to gather before triggering.

THE THINGS WE KEEP

This is a side quest achievement.

You need to:

  • Talk to a specific NPC (Wanda)
  • Follow her request
  • Complete the objective (like taking photos or finding items)

Important:

  • Always revisit NPCs after story progress
  • New dialogue can unlock new quests

SO, WHODUNIT?

This is a clue-based achievement.

You need to:

  • Find specific story-related items
  • Collect them in a single area

Usually includes:

  • Notes
  • Key objects
  • Evidence

If you rush through, you might miss one and lose the achievement.

COMIC RELIEF

This is tied to purchasing comics from the shop.

You:

  • Buy comics from the ammo store
  • Unlock achievement once enough are owned

Another reason why money matters.