Destroy the Universe
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The developers at Innerloop Studios included a built-in debug cheat to unlock the instantly. This works on the retail CD version, the digital re-release on GOG.com, and the original PC disc.
Download a "Project IGI All Missions Unlocked" configuration file from community repositories. You typically replace the existing mission folder or specific configuration files. project igi 1 all missions unlock top
Project IGI 1 All Missions Unlock: How to Access Every Level Instantly The developers at Innerloop Studios included a built-in
Method 2: The Network Configuration Edit (Permanent File Fix) the digital re-release on GOG.com