Can The Collector Achievement in Call of Duty Black Ops Zombie Mode be unlocked as a group?
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. :)