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