Here is the full list of all 35 Call of Duty: WWII achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Complete Operation Cobra
Complete D-Day.
Request Zussman to toss you First Aid Kits 30 times.
Request Pierson to spot enemies 25 times.
Request Turner to toss you ammo 20 times.
Request Stiles to toss you grenades 15 times
Request Aiello to toss you signal smoke and call in mortar strikes 10 times
Save 5 allies by throwing away a live enemy grenade.
Disable 50 enemies using smoke grenades.
Drag 10 allies to safety.
Get 6 groups of enemies to surrender.
Save 8 allies locked in struggle.
Collect all 33 mementos.
Spend 3 minutes using Focus in the campaign.
Complete the game on Veteran difficulty.
Breach the seawall in under two minutes without taking MG fire.
Protect your tanks by shooting down all planes in Operation Cobra.
Complete Stronghold.
Cover Zussman from the church without missing a shot in Stronghold.
Complete S.O.E.
Complete the driving portion of S.O.E. without hitting any obstacles.
Complete Liberation
Sneak through the courtyard undetected in Liberation.
Complete Collateral Damage.
Rescue your allies with the Sherman while keeping your armor above 80%.
Complete Death Factory.
Sneak through the Dragon's Teeth undetected in Death Factory.
Complete Hill 493.
Successfully escort the pole charge engineer to the pillbox in Hill 493.
Complete Battle of the Bulge.
Protect the bombers by personally shooting down 12 enemy planes.
Complete Ambush.
Reach the sniper perch without being detected in Ambush.
Complete the campaign.
Protect the convoy by shooting down all the planes in The Rhine.