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.
A duel between rivals.
Complete all challenges in a level.
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.
Crack the celerium worm.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Stop the brutality inflicted by the PDF.
Stop Menendez once and for all.
Jailor or executioner.
Escort the president to the secure location in downtown LA.
Interrogate Menendez.
Reinforcements on the way.
Capture Menendez.
Only one can survive.
Successfully assassinate SDC Chairman Tian Zhao.
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.
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.