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