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