Trouble with The Collector achievement?

Can you only get it on "Five"? Because I *think* I bought all of the weapons on Kino, but didn't get it. Did I miss one, or is it only on "Five"?

GameSpot Walkthrough

Call of Duty Black Ops Walkthrough
Black Ops agent Alex Mason relives memories of the Cold War. Our Call of Duty Black Ops Walkthrough provides a full walkthrough of the campaign, multiplayer tips, and the secrets of hidden zombies.
- Go to Online Walkthrough »

Type	Name	File Size
FAQ/Walkthrough	FAQ/Walkthrough by Realm117	94K
Other	Dead Ops Arcade Guide by dciguy01	92K
Weapon FAQ	Weapon FAQ by Master3203	49K
Achievement Guide	Achievement Guide by Lyokofreakguy	68K
Other	Nazi Zombie Weapon Guide by rata1	45K
FAQ/Strategy Guide	FAQ/Strategy Guide by wizardian20	32K
FAQ/Walkthrough	FAQ/Walkthrough by omegamustard	96K
Other	Nacht der Untoten Guide by Metroidude477	51K
Weapon FAQ	Weapon FAQ by Lyokofreakguy	37K
Other	Kino Der Toten FAQ by Realm117	26K
Other	Zombie Mode Data Guide by wilmer007	49K
FAQ/Walkthrough	FAQ/Walkthrough by Andrew Testa	44K
Other	Kino Der Toten FAQ by Pink_Sijibijiji	28K
Other	Kino der Toten Guide by M_dragon159	170K
Other	Zombie Mode Solo Guide by DdubEezy	43K
Other	Multiplayer FAQ by Acdcfantony	68K
Other	Five Guide by jimmythesnowman	198K
Other	Shotgun Guide by jimmythesnowman	59K
FAQ/Walkthrough	FAQ/Walkthrough by TheGum	51K
Other	Wager Match Guide by BoomZee	12K
Other	Dead Ops Arcade Guide by jimmythesnowman	50K
Other	Five Guide by CassyChan	50K
FAQ/Walkthrough	FAQ/Walkthrough by rata1	67K
Weapon FAQ	Weapon FAQ by ChozoZero	31K
Weapon FAQ	Weapon FAQ by KOH13	38K
Other	Perk Guide by KOH13	19K
Other	Trophy Guide by TripleJump	42K
Other	Multiplayer Combat Guide by aldecide	112K
Other	Der Riese Guide by CassyChan	98K