Here is the full list of all 68 Tannenberg achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Win a game with a points difference of 100 or less.
Win 25 Gold Medals.
Get 7 squad spawns on a single life as NCO.
Switch to other team when asked for autobalance.
Used voice commands 50 times.
Be the first to get killed by an enemy in a game.
Playing as the Entente Powers, capture the enemy HQ.
Playing as the K.u.K, lose a battle in the Carpathians.
Playing as the Infanterie, win a battle in East Prussia.
Playing as the Central Powers, capture the enemy HQ.
As Frontovik, while crouched, get 3 grenade kills.
Kill 25 enemies with artillery as the Central Powers.
Win 10 games as the Central Powers.
Start a private match.
Kill 4 enemies with a single grenade or call in.
Kill 25 enemies with artillery as the Entente Powers.
Damage two enemies with one bullet.
Win 10 matches as the Entente Powers.
Get a kill from 150m.
Unlock all specializations for the Cossacks.
Unlock all specializations for the K.u.K. Trupp.
Unlock all specializations for the Infanterie.
Unlock all specializations for the Bulgarians
Unlock all specializations for the Latvians.
Unlock all specializations for the Frontovik.
Complete a match on a night map.
Have your entire squad agree on a vote to change the squad name or type.
Fight in every weather condition.
Unlock all specializations for the Roumanians
Get 50 artillery kills using trench phones.
Check out the credits screen.
In a single life, take damage from melee attacks and gun shots from a player or players, before being killed by someone entirely different.
Kill 10 people with a heavy machine gun in a single life.
Get 10 kills with swords.
Visit every sector in a Maneuver match.
Die from falling down.
Club someone to death with binoculars.
Exhaust all your revolver ammo without missing a shot.
Cut off at least 3 enemy sectors.
Become cut-off in a sector.
Kill 25 enemies with a HMG.
Using a sword, kill an opponent who is also using a sword.
Kill 3 people with a sabre in an enemy held capture zone.
Complete a match on a snowy map.
Make a successful retreat
Chop off someone's limbs with a sword.
Perform a role switch.
Get the first kill in a match.
Get killed by bots 50 times.
Make 5 kills within the first two minutes of the match.
Get killed by your own grenade.
Complete a match on a foggy map.
Used voice chat.
Capture 10 enemy sectors.
Be part of the top scoring squad in a match.
Kill 4+ enemies in a capture zone.
Kill an enemy soldier manning a heavy machine gun with a head shot.
Call in Artillery or Recon from a sector.
Kill 5 NCO's in a match.
Issue 10 command orders.
Get a kill while injured.
Die 10 seconds after spawning.
Shoot an enemy while being suppressed or shaken by artillery.
Resupply your ammo.
Kill an enemy while shooting through an object.
Have a look at the overview map.
Capture an enemy sector alongside 10 or more other people.
Kick a bot off of a heavy machine gun.