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For the achievement in Call of Duty: Black Ops:

The Collector - In Zombie mode, buy every weapon off the walls in a single game.

I am wondering if it can be unlocked collectively as a group buying all of the weapons or do you have to buy them all on your own (as 1 player).

It would make a big difference in the strategy to take in order to get the achievement.

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Yes. Trophies can be unlocked by a group or in solo.

It's normally best to buy all weapons by a group to unlock this trophy, to achieve this trophy effectively, follow this method:

  • Be fair when opening doors, each player should take turns to spend their points when opening doors.
  • Be prepared to gain many points before going out to buy all weapons.
  • When ready to buy all of the weapons, use a grenade on a group of zombies (when near to end of a round) and make them legless which will leave you precious time to save running around to buy all weapons (including you and your friends/team mates to spend points towards the doors).

You may need about at least 10,000 roughly to spend on doors, and at least 12,000 to 15,000 (from what I remember ages ago). Which comes a total of between 22,000 to 25,000 points.

The Collector trophy does not require upgraded weapons or weapons from the mystery box.

This may be quite hard to achieve unless you have a good motivation of escaping and surviving from a large swarm of zombies and also taking them down, be sure to make good use of your grenades for high points when used against a swarm of zombies!

Optional: If you may want to test your luck, you can use the mystery box for a good, powerful weapon like the Alien/Ray gun could wipe out a lot of zombies in a few shots (better when upgraded) which will make you kick ass!

Tip: Don't camp. :)

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    Thanks, I unlocked this with a group, even though we had bought all the weapons off the walls it did not unlock until I bought each one myself though. For anyone trying this I would suggest to build up some cash once you've unlocked all the doors, make a crawler zombie, then you can easily run around and collect what you need.
    – Joel Briggs
    Commented Feb 28, 2011 at 15:43
  • Yes, exactly my points. Congratulations on the achievement. ;)
    – MacMac
    Commented Feb 28, 2011 at 16:07

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