The honest answer is "No." You cannot permanently unlock everything offline. Your best bet is to earn the lockpick, a silenced pistol, and the remote explosive online, then keep your console in Rest Mode indefinitely. It is a limitation you must accept.
To unlock everything , you are looking at approximately: hitman 2 offline unlock everything
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But where there is a will (and a modding community), there is a way. The honest answer is "No
Hitman 2 Offline: How to Unlock Everything & Bypass the Always-Online Requirement To unlock everything , you are looking at
The Peacock Project is a fan-made tool that emulates the game's servers on your own PC, effectively granting "offline" access to features that are usually locked.
(Mastery 7 for the Electronic Key Hacker) while connected to the internet. Once earned, they remain available if you later switch to Offline Mode. Community-Driven Solutions (PC Only)