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.
Collect all intel.
Use a future weapon in the past.
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.
Stop the brutality inflicted by the PDF.
Plastic surgery avoided.
Minimum score of 10k in every mission.
Successfully rescue HVI.
Only one can survive.
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.
Crack the celerium worm.
Capture Menendez.
Successfully assassinate SDC Chairman Tian Zhao.
Capture Manuel Noriega and bring him to justice.
There are two futures.
Find the Karma weapon.
Successfully escort the VIPs to safety.
Gather information on Raul Menendez' suspected terrorist plot.
Complete a level with customized loadout.
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.