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