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