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.
A duel between rivals.
Complete all future levels in veteran.
Crack the celerium worm.
There are two futures.
Successfully rescue HVI.
Stop the brutality inflicted by the PDF.
Use a future weapon in the past.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Complete the campaign on Hardened or Veteran difficulty.
Complete all challenges in a level.
Collect all intel.
Minimum score of 10k in every mission.
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.
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 escort the VIPs to safety.
Find the Karma weapon.
Plastic surgery avoided.
Successfully defend FOB Spectre from incursion.
Successfully neutralize the SDC freighter at Keppel Terminal.
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.