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.
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.
Crack the celerium worm.
Collect all intel.
Reinforcements on the way.
Stop the brutality inflicted by the PDF.
There are two futures.
Plastic surgery avoided.
Use a future weapon in the past.
Complete a level with customized loadout.
Stop Menendez once and for all.
Jailor or executioner.
Minimum score of 10k in every mission.
Escort the president to the secure location in downtown LA.
Interrogate Menendez.
Capture Menendez.
Only one can survive.
Successfully assassinate SDC Chairman Tian Zhao.
Capture Manuel Noriega and bring him to justice.
Listen and think before you shoot.
Successfully rescue HVI.
Successfully escort the VIPs to safety.
Find the Karma weapon.
Gather information on Raul Menendez' suspected terrorist plot.
Successfully neutralize the SDC freighter at Keppel Terminal.
Take down Menendez and his operation.
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.