Fully Customised W2000 Sniper 25G
All custom W2000 components purchased

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Upgrade Custom Weapon Achievement Cheat/Glitch - Full credit to s1u5h13

I have edited it a little and made the grammer a touch better
Alright save up around 1.6 mill or so, then save.

Enter any level, im gonna pick "Till Death Us Do Part" or "A New Life" since they are the shortest. Goto upgrade weapons, upgrade any weapon you want to 100%, buy every upgrade you can, only for that 1 weapon then start the level, complete it, then you'll get the achievement for the weapon you fully upgraded. Shut off your console before saving! or continuing. DO NOT SAVE! If you then restart your console, and load your save game, you will still have all your cash, minus the upgraded weapon, but still holding the achievement you had just gained! Repeat as above but upgrading a different weapon each time, and you will be able to gain all the achievements for each gun, without having to earn enough money to do them all at the same time!!

Can be done on any difficulty, or spread out over multiple difficulties.. (achievement is given as soon as the weapon is upgraded and a level completed, not once all are upgraded at the same time)

Simply fully upgrade the weapon (requires all the Kruger Schmidt upgrade tiers be unlocked) Once upgraded, play through and complete the level for the achievement to be unlocked.