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