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.
A duel between rivals.
Minimum score of 10k in every mission.
Collect all intel.
Use a future weapon in the past.
Successfully rescue HVI.
Reinforcements on the way.
Crack the celerium worm.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully escort the VIPs to safety.
Plastic surgery avoided.
Successfully neutralize the SDC freighter at Keppel Terminal.
Complete all future levels in veteran.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
There are two futures.
Complete the campaign on Hardened or Veteran difficulty.
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.
Listen and think before you shoot.
Find the Karma weapon.
Gather information on Raul Menendez' suspected terrorist plot.
Take down Menendez and his operation.
Stop the brutality inflicted by the PDF.
Successfully defend FOB Spectre from incursion.
Gather intel on Raul Menendez from Mullah Rahmaan.
Complete 1 challenge in any level.
Investigate the jungle facility.
Rescue Woods.
Complete a level with customized loadout.