In halo 3, do I need all 49 ORIGINAL achievments to get security and katana

[Jude C]

or can I use other Achievments? Some of the original achievments are hard to get so I am wondering If you can get it from maybe the legendary achievments, I heard you need 1075 to get security with any achievments and Im checking if its true. If someone could maybe help me some some to that would also be nice. My gamertag is PopRoxNSoda

 

[Jesse H]

you can use any achievements but it is easier to just usethe main 49