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