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