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.
A duel between rivals.
Complete all challenges in Black Ops II.
Collect all intel.
Minimum score of 10k in every mission.
Successfully rescue HVI.
Complete all future levels in veteran.
Complete the campaign on Hardened or Veteran difficulty.
Stop the brutality inflicted by the PDF.
Complete all challenges in a level.
Use a future weapon in the past.
Reinforcements on the way.
Crack the celerium worm.
Successfully assassinate SDC Chairman Tian Zhao.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
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.
Stop Menendez once and for all.
Jailor or executioner.
Escort the president to the secure location in downtown LA.
Interrogate Menendez.
Capture Menendez.
Only one can survive.
Capture Manuel Noriega and bring him to justice.
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.
Complete 1 challenge in any level.
Investigate the jungle facility.
Rescue Woods.
Complete a level with customized loadout.