Custom Steam Achievement Timestamp Tool

Job ID: 40004062

Budget: $250 – $750 USD

I need a Windows-only utility that can unlock any achievement for games I already own and assign a custom date and time to the unlock — including dates many years in the past.
This tool must work locally only, by editing the relevant userstats or similar Steam files stored on my PC. No API calls, no Steam server interaction.

Key expectations

Built in C# for clean, maintainable Windows development.

Minimalistic GUI:
A small window with:

Game selector

Achievement selector

Date/time picker

Apply button

The tool should only modify local files that Steam itself already uses.
No packet spoofing, no token manipulation, no VAC-related behavior.

Clean, stable code that avoids unnecessary dependencies.

Optional: ability to queue several achievements and apply timestamps in one batch.

Deliverables

A compiled .exe ready for Windows 10/11.

Full C# source code with clear comments.

A short readme explaining how the tool works.

Payment

I’m ready to pay a very good amount for a working solution.

Please contact me only if you’re confident you can build this.