What it requires
OFFICIAL (Steam): "Upgrade any tool once."
How it fits the chain
Step one of the four-achievement progression ladder:
- First Investment (1 upgrade) — this page.
- Fully Equipped (10 upgrades total).
- Master of the Trade (all tools maxed).
The tutorial's Getting Your Hands Dirty precedes the ladder.
How to approach it
- Upgrade the tool you use most frequently — the counts behave the same, and the effect compounds through later levels.
- Money is earned by completing jobs; exact upgrade costs are UNVERIFIED in this repository and are deliberately not listed. See the upgrade categories reference for what each tool-line contains.
Missable?
No — upgrading works across every job (the hub table lists this as non-missable).