Here is the full list of all 58 Paladins achievements. It takes around 200 hours to unlock all of the achievements on Windows.
200 Double Kills.
Play over 300 matches
Kill an enemy player from over 300 units away.
Heal over 100,000 health in a match
Play 100 hours with a player from your friends list in your party.
Play 250 hours with a player from your friends list in your party.
Shield over 200,000 damage in a match
Kill an enemy player who is on a 15 killstreak or higher.
Earn over 500,000 Gold over your play history
Play 25 hours with a player from your friends list in your party.
10 Champions at Mastery 5.
9 Champions at Mastery 5.
8 Champions at Mastery 5.
7 Champions at Mastery 5.
Survive more than 50 battles with less than 10% health.
100 Double Kills
6 Champions at Mastery 5.
4 Champions at Mastery 5.
5 Champions at Mastery 5.
Play 100 matches while in a party.
Kill more than 20 enemy champions in a single match.
Spend over 100,000 Credits in the item store over all your matches
50 Double Kills.
Play 10 hours with a player from your friends list in your party.
Get a daily reward 7 days in a row
3 Champions at Mastery 5.
Land 5 headshots in a row without missing.
Play 50 matches while in a party.
Build your own custom loadout
Deal damage to every enemy champion in a match before any of them damage you.
Kill a player with an environmental hazard.
Reach a 20 kill streak in a match
2 Champions at Mastery 5.
Unlock 100 Cards.
Unlock Ranked
Have a Paladins account over 1 year old
Kill an enemy champion after they had already killed you.
1 Champion at Mastery 5.
Play 5 hours with a player from your friends list in your party.
10 Double Kills.
Play 20 matches while in a party.
Kill an enemy player while you are at or below 50 Health.
Play 10 matches while in a party.
Deal more than 100,000 damage during a match.
Die to an environmental hazard.
Get a killing blow after the round has ended.
Win a match where the enemy team scored no points.
Kill a player in the air who is over 100 units above the ground.
Play a match while in a party.
Complete the Paladins Tutorial.
400 Double Kills.
Reach level 30 during the Paladins Beta.
Be the only player alive in a match.
Earn over 1,000,000 Gold over your play history
Reach Master in Ranked
Have over 30 different champions at mastery level 10 or higher
Have over 30 different champions at mastery level 15 or higher
Have over 30 different champions at mastery level 20 or higher