Here is the full list of all 61 Northgard achievements worth 1,000 gamerscore.
Win by forging the Sword of Odin [not in Story Mode]
Achieve 10 victories with any clan [not in Story Mode]
Build the Relic of Svalinn
Kill 10 Rock Golems
Build the Relic of Eldhrumnir
Build the Relic of Mjöllnir
Win with the clan of the Raven [not in Story Mode]
Build the Relic of Naglfar
Win by taking control of Yggdrasil [not in Story Mode]
Win with the clan of the Bear [not in Story Mode]
Build the Relic of Scabbard of Gram
Complete each of the secret objectives of the sixth chapter of Rig's Saga
Win with the clan of the Goat [not in Story Mode]
Achieve a Trade Victory [not in Story Mode]
Build the Relic of Gefjun's Jar
Win a Ragnarok game
Achieve a Wisdom Victory [not in Story Mode]
Win with the Clan of the Boar [not in Story Mode]
Build the Relic of Mask of Gullinbursti
Befriend the Myrkalfar
Achieve a Domination Victory [not in Story Mode]
Win with the clan of the Wolf [not in Story Mode]
Build the Relic of Horn of Managarm
Win by guarding the Gate of Helheim [not in Story Mode]
Kill 10 Valkyries in a single game [not in Story Mode]
Unlock level 3 of the Guardian Path
Build the Relic of Jörmunr
Kill 3 bears in a single game [not in Story Mode]
Colonize 1 geyser tile [not in Story Mode]
Heal Vedrfolnir once [not in Story Mode]
Explore every zone of Northgard [not in Story Mode]
Kill 20 Wolves in a single game [not in Story Mode]
Unlock the Giant's Warchief [not in Story Mode]
Achieve a Fame Victory [not in Story Mode]
Win with the clan of the Stag [not in Story Mode]
Colonize the Thor Wrath tile once [not in Story Mode]
Unlock level 3 of the Tactician Path
Kill the Wyvern [not in Story Mode]
Build the Relic of Bragaful
Unlock level 3 of the Conqueror Path
Build the Relic of Hlidskjalf
Kill 20 Draugar in a single game [not in Story Mode]
Destroy a Kobold camp [not in Story Mode]
Complete Rig's Saga in Normal difficulty (or above)
Complete each of the secret objectives of the fifth chapter of Rig's Saga
Complete each of the secret objectives of the fourth chapter of Rig's Saga
Complete each of the secret objectives of the third chapter of Rig's Saga
Complete each of the secret objectives of the second chapter of Rig's Saga
Complete each of the secret objectives of the first chapter of Rig's Saga
Achieve 25 victories with any clan [not in Story Mode]
Achieve 50 victories with any clan [not in Story Mode]
Achieve 100 victories with any clan [not in Story Mode]
Achieve 250 victories with any clan [not in Story Mode]
Complete each of the secret objectives of the seventh chapter of Rig's Saga
Complete each of the secret objectives of the eighth chapter of Rig's Saga
Complete each of the secret objectives of the ninth chapter of Rig's Saga
Complete each of the secret objectives of the tenth chapter of Rig's Saga
Complete each of the secret objectives of the eleventh chapter of Rig's Saga
Complete all the secret objectives in every chapters of Rig's Saga
Complete Rig's Saga in Hard difficulty (or above)
Complete Rig's Saga in Expert difficulty