Here is the full list of all 49 Blood of Steel achievements.
Have 1 in-game friend
Kill 5000 enemies
Get 10 wins in Randed Match mode
Obtain 1 permanent Rider Hero
Slay 100 heroes
Collect 5 Heroes
Complete 500 assists
Complete 20 battles with Warrior Hero in Legion War/Ranked Legion War
Kill 500 enemies
Slay 10 heroes
Kill 50 enemies
Gain 10000 Silver
Complete 50 assists
Obtain 1 permanent Ranger Hero
Obtain 1 permanent Warrior Hero
Upgrade 1 hero to Lv.11
Upgrade 1 hero to Lv.12
Collect 25 Heroes
Own 10 permanent Horse Skins
Own 10 Hero Skins
Own 10 permanent Primary Weapon Skins
Own 10 permanent Accessory Skins
Own 10 permanent Shield Skins
Own 10 permanent Secondary Weapon Skins
Own 50 Hero Skins
Own 50 permanent Primary Weapon Skins
Own 50 permanent Accessory Skins
Gain 1000000 Silver
Complete 20 battlefields
Complete 200 battlefields
Complete 2000 battlefields
Get 100 wins in Randed Match mode
Get 100 wins in 5V5 Rank Practice mode
Complete 100 victories in 7v7 Corps Battle
Complete 100 victories in 10v10 Great Battle
Slay 1000 heroes
Complete 5000 assists
Complete 200 battles with Warrior Hero in Legion War/Ranked Legion War
Complete 2000 battles with Warrior Hero in Legion War/Ranked Legion War
Complete 20 battles with Ranger Hero in Legion War/Ranked Legion War
Complete 200 battles with Ranger Hero in Legion War/Ranked Legion War
Complete 2000 battles with Ranger Hero in Legion War/Ranked Legion War
Complete 20 battles with Rider Hero in Legion War/Ranked Legion War
Complete 200 battles with Rider Hero in Legion War/Ranked Legion War
Complete 2000 battles with Rider Hero in Legion War/Ranked Legion War
Complete 20 victories in Siege Battle
Complete 200 victories in Siege Battle
Get 100 wins in Hero Arena (Bot Match excluded)
Get 1000 likes