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