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.
Only one can survive.
Use a future weapon in the past.
Collect all intel.
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.
There are two futures.
Listen and think before you shoot.
Plastic surgery avoided.
Stop the brutality inflicted by the PDF.
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.
Crack the celerium worm.
Capture Menendez.
Successfully assassinate SDC Chairman Tian Zhao.
Capture Manuel Noriega and bring him to justice.
Successfully rescue HVI.
Find the Karma weapon.
Successfully neutralize the SDC freighter at Keppel Terminal.
Successfully escort the VIPs to safety.
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.
Complete 1 challenge in any level.
Investigate the jungle facility.
Complete a level with customized loadout.
Rescue Woods.