A Reddit user (via MP1st) has posted the entire Black Ops 2 multiplayer unlock progression. This is the order of what you will get at certain levels for leveling up:

Level 4

  • MTAR (AR)
  • Type 25 (AR)
  • SWAT-556 (AR)
  • MP7 (SMG)
  • PDW-57 (SMG)
  • QBB LMG (LMG)
  • MK48 (LMG)
  • R870 MCS (Shotgun)
  • Saiga 12 (Shotgun)
  • SVU-AS (Sniper)
  • DSR-50 (Sniper)
  • Five-Seven (Pistol)
  • TAC-45 (Pistol)
  • SMAW (Launcher)
  • FHJ-18 AA (Launcher)
  • Lightweight (Perk 1)
  • Hardline (Perk 1)
  • Toughness (Perk 2)
  • Cold Blooded (Perk 2)
  • Dexterity (Perk 3)
  • Extreme Conditioning (Perk 3)
  • Perk 1 Greed (Wildcard)
  • Grenade (Lethal)
  • Semtex (Lethal)
  • Concussion Grenade (Tactical)
  • Smoke Grenade (Tactical)

See the full unlock list after the break!

 

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Level 5

  • Blind Eye (Perk 1)

Level 6

  • Sensor Grenade (Tactical)

Level 7

Scorestreaks unlocked, this entire tier is streaks

  • UAV
  • Hunter Killer
  • Care Package
  • Lightning Strike
  • Dragonfire
  • VTOL Warship

Level 8

  • Fast Hands (Perk 2)

Level 9

  • Sentry Gun (Streak)

Level 10

  • Perk 2 Greed (Wildcard)

Level 11

  • EMP Grenade (Tactical)

Level 12

  • Lodestar (Streak)

Level 13

  • LSAT (LMG)
  • Perk 3 Greed (Wildcard)

Level 14

  • Engineering (Perk 3)

Level 15

  • Guardian (Streak)

Level 16

  • Vector (SMG)

Level 17

  • Combat Axe (Lethal)

Level 18

  • Overkill (Wildcard)
  • RC-XD (Streak)

Level 19

  • B23R (Pistol)
  • Secondary Gunfighter (Wildcard)

Level 20

  • Tactical Mask (Perk 3)

Level 21

  • Stealth Chopper (Streak)

Level 22

  • FAL (AR)
  • Primary Gunfighter (Wildcard)

Level 23

  • Shock Charge (Tactical)

Level 24

  • Hellstorm Missile (Streak)

Level 25

  • Crossbow (Special)
  • Tactician (Wildcard)
  • Black Hat PDA (Tactical)

Level 26

  • Hard Wired (Perk 2)

Level 27

  • AGR Drone (Streak)

Level 28

  • MSMC (SMG)
  • Danger Close (Wildcard)
  • Bouncing Betty (Lethal)

Level 29

  • Flashbang Grenade (Tactical)

Level 30

  • Warthog (Streak)

Level 31

  • M27 (AR)
  • Executioner (Pistol)

Level 32

  • Flak Jacket (Perk 1)

Level 33

  • Counter-UAV (Streak)

Level 34

  • KSG (Shotgun)
  • Assault Shield (Special)

Level 35

  • Trophy System (Tactical)

Level 36

  • Death Machine (Streak)

Level 37

  • Chicom CQB (SMG)
  • HAMR (LMG)

Level 38

  • Dead Silence (Perk 3)

Level 39

  • EMP Systems (Streak)

Level 40

  • SCAR (AR)
  • RPG-7 (Launcher)

Level 41

  • C4 (Lethal)

Level 42

  • Orbital VSAT (Streak)

Level 43

  • Ballista (Sniper)
  • KAP-40 (Pistol)

Level 44

  • Scavenger (Perk 2)

Level 45

  • War Machine (Streak)

Level 46

  • SMR (AR)
  • Skorpion EVO II (SMG)

Level 47

  • Tactical Insertion (Tactical)

Level 48

  • Escort Drone (Streak)

Level 49

  • M8A1 (AR)
  • Ballistic Knife (Special)

Level 50

  • Awareness (Perk 3)

Level 51

  • K-9 Unit (Streak)

Level 52

  • M1216 (Shotgun)
  • XPR-50 (Sniper)

Level 53

  • Claymore (Lethal)

Level 54

  • Swarm (Streak)

Level 55

  • AN-94 (AR)
  • Ghost (Perk 1)

 

SOURCE: MP1st via Reddit