Here is the full list of all 35 Call of Duty: Black Ops II achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
Crack the celerium worm.
Reinforcements on the way.
A duel between rivals.
Complete all future levels in veteran.
Complete the campaign on Hardened or Veteran difficulty.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Complete all challenges in Black Ops II.
Stop the brutality inflicted by the PDF.
Only one can survive.
Minimum score of 10k in every mission.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully rescue HVI.
Use a future weapon in the past.
Complete all challenges in a level.
Collect all intel.
Stop Menendez once and for all.
Jailor or executioner.
Escort the president to the secure location in downtown LA.
Interrogate Menendez.
Capture Menendez.
Capture Manuel Noriega and bring him to justice.
There are two futures.
Listen and think before you shoot.
Successfully escort the VIPs to safety.
Find the Karma weapon.
Successfully neutralize the SDC freighter at Keppel Terminal.
Gather information on Raul Menendez' suspected terrorist plot.
Plastic surgery avoided.
Take down Menendez and his operation.
Successfully defend FOB Spectre from incursion.
Gather intel on Raul Menendez from Mullah Rahmaan.
Investigate the jungle facility.
Complete 1 challenge in any level.
Rescue Woods.
Complete a level with customized loadout.