Here is the full list of all 38 World of Warships: Legends achievements worth 1,000 gamerscore.
Own 10 American or British ships in any proportion at the same time
Capture a key area or base 3 times in Standard battles
Win a Standard battle while being the sole survivor in your team
Set enemy ships on fire 7 times in a single Standard battle
Destroy 20 enemy ships in Standard battles
Promote a Commander to rank 7
Promote a Commander to rank 2
Win a Standard battle and survive while also obtaining the highest XP of your team
Defend the base or a key area 3 times in Standard battles
Destroy an enemy ship dealing 50% or more damage with a single salvo in a Standard battle
Research a Tier III ship
Install a ship upgrade
Survive and win any battle
Play 100 Standard battles as a Destroyer
Play 100 Standard battles as a Cruiser
Play 100 Standard battles as a Battleship
Destroy 200 enemy ships in Standard battles
Destroy 50 enemy ships with your torpedoes in Standard battles
Destroy more enemy ships than any other member of your team (at least 5) in a Standard battle
Win a Standard battle and survive while part of a Division
Win a Standard battle and survive while also earning 200,000 credits
Score 5 citadel hits in a single Standard battle
Destroy enemy ship modules 100 times in Standard battles
Earn 20 ribbons (excluding the 'Target Hit' ribbons) in a single Standard battle
Destroy at least 4 enemy ships in a single Standard battle with an American or British ship
Destroy at least 4 enemy ships in a single Standard battle with a Japanese or German ship
Destroy an enemy by fire that exceeds 50% of its HP in a Standard battle
Destroy an enemy by flooding that exceeds 50% of its HP in a Standard battle
Install 6 upgrades or modifications in any combination on a single ship
Research a Tier V ship
Unlock and install all modifications on a Tier VII American or British ship
Unlock and install all modifications on a Tier VII Japanese or German ship
Own 10 Japanese or German ships in any proportion at the same time
Promote a Commander to rank 11
Promote a Commander to rank 16
Simultaneously have 5 American or British commanders in your roster
Simultaneously have 5 Japanese or German commanders in your roster
Promote Commander to legendary rank 1