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.
Only one can survive.
Reinforcements on the way.
Crack the celerium worm.
Stop the brutality inflicted by the PDF.
Minimum score of 10k in every mission.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully rescue HVI.
Collect all intel.
Complete all challenges in a level.
Use a future weapon in the past.
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.
A duel between rivals.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Successfully defend FOB Spectre from incursion.
Interrogate Menendez.
Capture Menendez.
Capture Manuel Noriega and bring him to justice.
There are two futures.
Listen and think before you shoot.
Find the Karma weapon.
Successfully escort the VIPs to safety.
Gather information on Raul Menendez' suspected terrorist plot.
Plastic surgery avoided.
Successfully neutralize the SDC freighter at Keppel Terminal.
Take down Menendez and his operation.
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.