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