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