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