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.
A duel between rivals.
Stop the brutality inflicted by the PDF.
Reinforcements on the way.
Crack the celerium worm.
Use a future weapon in the past.
Minimum score of 10k in every mission.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully rescue HVI.
Successfully defend FOB Spectre from incursion.
Successfully escort the VIPs to safety.
Successfully neutralize the SDC freighter at Keppel Terminal.
Complete all future levels in veteran.
Complete the campaign on Hardened or Veteran difficulty.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Listen and think before you shoot.
Plastic surgery avoided.
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.
Capture Manuel Noriega and bring him to justice.
There are two futures.
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.
Complete a level with customized loadout.