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 20 or higher
Reach Master in Ranked
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.
Have over 30 different champions at mastery level 15 or higher
Have a Paladins account over 1 year old
Have over 30 different champions at mastery level 10 or higher
Survive more than 50 battles with less than 10% health.
Earn over 1,000,000 Gold over your play history
Play 25 hours with a player from your friends list in your party.
400 Double Kills.
Play over 300 matches
Heal over 100,000 health in a match
10 Champions at Mastery 5.
9 Champions at Mastery 5.
6 Champions at Mastery 5.
7 Champions at Mastery 5.
8 Champions at Mastery 5.
Earn over 500,000 Gold over your play history
Reach level 30 during the Paladins Beta.
Kill an enemy player from over 300 units away.
200 Double Kills.
Shield over 200,000 damage in a match
Unlock Ranked
100 Double Kills
Play 100 matches while in a party.
50 Double Kills.
Spend over 100,000 Credits in the item store over all your matches
Unlock 100 Cards.
Reach a 20 kill streak in a match
Land 5 headshots in a row without missing.
Play 10 hours with a player from your friends list in your party.
Play 50 matches while in a party.
5 Champions at Mastery 5.
4 Champions at Mastery 5.
Get a daily reward 7 days in a row
3 Champions at Mastery 5.
Play 5 hours with a player from your friends list in your party.
Build your own custom loadout
Deal more than 100,000 damage during a match.
2 Champions at Mastery 5.
Play 20 matches while in a party.
Kill a player with an environmental hazard.
1 Champion at Mastery 5.
Get a killing blow after the round has ended.
Play 10 matches while in a party.
Die to an environmental hazard.
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.
Kill more than 20 enemy champions in a single match.
10 Double Kills.
Kill an enemy player who is on a 15 killstreak or higher.
Play a match while in a party.
Be the only player alive in a match.
Kill a player in the air who is over 100 units above the ground.
Deal damage to every enemy champion in a match before any of them damage you.
Complete the Paladins Tutorial.