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.
Complete all challenges in Black Ops II.
Complete all challenges in a level.
Collect all intel.
Minimum score of 10k in every mission.
Reinforcements on the way.
Crack the celerium worm.
A duel between rivals.
Use a future weapon in the past.
Stop the brutality inflicted by the PDF.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully neutralize the SDC freighter at Keppel Terminal.
Successfully rescue HVI.
Jailor or executioner.
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.
There are two futures.
Listen and think before you shoot.
Successfully escort the VIPs to safety.
Stop Menendez once and for all.
Escort the president to the secure location in downtown LA.
Interrogate Menendez.
Capture Menendez.
Only one can survive.
Capture Manuel Noriega and bring him to justice.
Find the Karma weapon.
Gather information on Raul Menendez' suspected terrorist plot.
Plastic surgery avoided.
Take down Menendez and his operation.
Complete a level with customized loadout.
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.