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