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