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